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Gauss Law And It's Application MCQ - Practice Questions with Answers

Gauss Law And It's Application MCQ - Practice Questions with Answers

Edited By admin | Updated on Sep 25, 2023 25:23 PM | #NEET

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Gauss law, Applications of Gauss Law(I), Applications of Gauss Law(II), Applications of Gauss Law(IV), Applications of Gauss Law(V) are considered the most difficult concepts.
69 Questions around this concept.

Solve by difficulty

If the electric flux entering and leaving an enclosed surface respectively is $\phi _{1}$ and $\phi _{2}$ , the electric charge inside the surface will be:

A

$\left ( \phi _{2}-\phi _{1} \right )\varepsilon _{0}$

Correct Answer

Wrong Answer

B

$\left ( \phi _{1}+\phi _{2} \right )/\varepsilon _{0}$

Correct Answer

Wrong Answer

C

$2$ $\left ( \phi _{2}-\phi _{1} \right )/\varepsilon _{0}$

Correct Answer

Wrong Answer

D

$2$ $\left ( \phi _{1}+\phi _{2} \right )/\varepsilon _{0}$

Correct Answer

Wrong Answer

Let $P(r)=\frac{Q}{\pi R^{4}}r$ be the charge density distribution for a solid sphere of radius $R$ and total charge $Q$ . For a point $'p'$ inside the sphere at a distance $r_{1}$ from the centre of the sphere, the magnitude of the electric field is

A

0

Correct Answer

Wrong Answer

B

$\frac{Q}{4\pi \varepsilon _{0}r_{1}^{2}}\; \;$

Correct Answer

Wrong Answer

C

$\; \frac{Qr_{1}^{2}}{4\pi \varepsilon _{0}R^{4}}\; \; \;$

Correct Answer

Wrong Answer

D

$\; \frac{Qr_{1}^{2}}{3\pi \varepsilon _{0}R^{4}}\;$

Correct Answer

Wrong Answer

Let there be a spherically symmetric charge distribution with charge density varying as $\rho (r)=\rho _{0}\left ( \frac{5}{4}-\frac{r}{R} \right )\; upto\; r=R,and\; \rho (r)=0\; for\; r> R,$ where $r$ is the distance from the origin. The electric field at a distance $r(r< R)$ from the origin is given by

A

$\frac{\rho _{0}r}{3\varepsilon _{0}}\left ( \frac{5}{4}-\frac{r}{R} \right )$

Correct Answer

Wrong Answer

B

$\frac{4\pi \rho _{0}r}{3\varepsilon _{0}}\left ( \frac{5}{3}-\frac{r}{R} \right )$

Correct Answer

Wrong Answer

C

$\frac{\rho _{0}r}{4\varepsilon _{0}}\left ( \frac{5}{3}-\frac{r}{R} \right )$

Correct Answer

Wrong Answer

D

$\frac{4\rho _{0}r}{3\varepsilon _{0}}\left ( \frac{5}{4}-\frac{r}{R} \right )$

Correct Answer

Wrong Answer

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$q_1, q_2, q_3, q_4$ are point charges located at points as shown in the figure and s is a spherical Gaussian surface of radius $R$. Which of the following is true according to Gauss's law

A

$\int_s\left(\vec{E}_1+\vec{E}_2+\vec{E}_3\right) d \vec{A}=\frac{q_1+q_2+q_3}{2 \varepsilon_0}$

Correct Answer

Wrong Answer

B

$\int_s\left(\vec{E}_1+\vec{E}_2+\vec{E}_3\right) d \vec{A}=\frac{q_1+q_2+q_3}{ \varepsilon_0}$

Correct Answer

Wrong Answer

C

$\int_s\left(\vec{E}_1+\vec{E}_2+\vec{E}_3\right) d \vec{A}=\frac{q_1+q_2+q_3+q_4}{\varepsilon_0}$

Correct Answer

Wrong Answer

D

None of the above

Correct Answer

Wrong Answer

A charge Q is enclosed by a Gaussian spherical surface of radius R. If the radius is doubled, then the outward electric flux will

A

increase four times

Correct Answer

Wrong Answer

B

be reduced to half

Correct Answer

Wrong Answer

C

remain the same

Correct Answer

Wrong Answer

D

be doubled

Correct Answer

Wrong Answer

Shown below is a distribution of charges. The flux of the electric field due to these charges through the surface S is

A

$3 q / \varepsilon_0$

Correct Answer

Wrong Answer

B

$2 q / \varepsilon_0$

Correct Answer

Wrong Answer

C

$q / \varepsilon_0$

Correct Answer

Wrong Answer

D

zero

Correct Answer

Wrong Answer

A cone of base radius R and height $h$ is located in a uniform electric field $E$ parallel to its base. The electric flux entering the cone is :

A

$\frac{1}{2} E h R$

Correct Answer

Wrong Answer

B

EhR

Correct Answer

Wrong Answer

C

2EhR

Correct Answer

Wrong Answer

D

4EhR

Correct Answer

Wrong Answer

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Electric charge is uniformly distributed along a long straight wire of radius 1 mm. The charge per cm length of the wire is Q coulomb. Another cylindrical surface of radius 50 cm and length 1 m symmetrically encloses the wire as shown in the figure. The total electric flux passing through the cylindrical surface is

A

$Q / \varepsilon_0$

Correct Answer

Wrong Answer

B

$100Q / \varepsilon_0$

Correct Answer

Wrong Answer

C

$10 Q / \pi \varepsilon_0$

Correct Answer

Wrong Answer

D

$100 Q / \pi \varepsilon_0$

Correct Answer

Wrong Answer

A charged ball $B$ hangs from a silk thread $S$, which makes an angle $\theta$ with a large charged conducting sheet $P$, as shown in the figure. The surface charge density $\sigma$ of the sheet is proportional to

A

$\sin \theta$

Correct Answer

Wrong Answer

B

$\tan \theta$

Correct Answer

Wrong Answer

C

$\cos \theta$

Correct Answer

Wrong Answer

D

$\cot \theta$

Correct Answer

Wrong Answer

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A solid conducting sphere having a charge Q is surrounded by an uncharged concentric conducting hollow spherical shell. Let the potential difference between the surface of the solid sphere and that of the outer surface of the hollow shell be V. If the shell is now given a charge of –3Q, the new potential difference between the same two surfaces is

A

V

Correct Answer

Wrong Answer

B

2V

Correct Answer

Wrong Answer

C

4V

Correct Answer

Wrong Answer

D

-2V

Correct Answer

Wrong Answer

Concepts Covered - 6

Gauss law

Gauss's law:

Gauss's law is one of the fundamental laws of physics which states that the net flux of an electric field in a closed surface is directly proportional to the enclosed electric charge. It is one of the four equations of Maxwell’s laws of electromagnetism.

The diagram below shows a locally uniform electric field E. The lines are parallel and have constant density. The same surface is inserted in three different orientations. The maximum number of field lines is intercepted when unit vector normal to the surface, n, is parallel to the field E, while no field lines pass through the surface when n is perpendicular to the field. In general, the number of field lines passing through an area A is directly proportional to A*cosθ, where θ is the angle between the field direction and the unit vector n normal to the surface. This leads to the definition of the electric flux.

The surface on which Gauss's law is applied is called Gaussian Surface (as shown in the below figure).

Note- Remember that the closed surface in Gauss's law is imaginary. There need not be any material object at the position of the surface.

Gauss law for a closed surface states that :

$\phi _{\text{closed}}=\frac{q_{net}}{\epsilon_{0} }$ , $q_{net}$ is the total charge inside the closed surface. The closed surface on which we apply gauss law is called the gaussian surface.

Also, the flux can be written in the integral form as:

$\phi =\int \bar{E} \dot d\bar{S}$ S is the area enclosed and E is the electric field intensity passing through it.

The usefulness of Gauss's law :

1. Gauss's law is useful when the gaussian surface has symmetry about the charge.

2. We can take any gaussian surface but the Gaussian surface should not pass through the charge. iI can pass through the charge but it can pass through continuous charge distribution.

The limitation of Gauss law-

Gauss law is applicable to certain symmetrical shapes it cannot be used for disk and ring and an electric dipole etc.

Applications of Gauss Law(I)

Applications of Gauss Law-I:

Electric field due to infinite linear charge :

The electric field of an infinite line charge with a uniform linear charge density can be obtained by using Gauss's law. Considering a Gaussian surface in the form of a cylinder at radius r, the electric field has the same magnitude at every point of the cylinder and is directed outward. The electric flux is then just the electric field times the area of the cylinder.

Earlier we have derived the electric field due to the infinite line charge as :

$E= \frac{\lambda}{2 \pi \epsilon_{0} r}$ where $\lambda$ is linear charge density. Here the gaussian surface will be the cylinder around the linear charge of length l .

Gauss's law :

$\phi =\oint E \cdot dA = \frac{Q_{inside}}{\epsilon_{0}}$

Here cylinder has 3 surfaces: 1. Upper 2. lower 3. Curved

$\phi _{cylinder}=\phi _{1}+\phi _{2}+\phi _{3}$

$=0+0+\int EdA \cos{0}$

$\implies \phi =\int EdA =\frac{Q_{inside}}{\epsilon_{0}}$

$\implies \phi =E \int dA =\frac{Q_{inside}}{\epsilon_{0}}$

$\implies \phi =E (2\pi r l)=\frac{Q_{inside}}{\epsilon_{0}}$

$\implies E = (2\pi r l)=\frac{\lambda l}{2 \pi a \times l\times \epsilon_{0}}$ since, $\lambda= \frac{Q_{inside}}{l}$

$\implies E=\frac{\lambda}{2\pi\epsilon r}$

Therefore E is inversely proportional to r.

Applications of Gauss Law(II)

Applications of Gauss Law(II)

Electric field in a conductor:

We have studied that conductors have a large number of free electrons that are free to move inside the conductors but metal ions are fixed. Now if we place this conductor in an electric field, due to the electric field, electrons will experience a force.

The total electric field at any point in the conductor is the vector sum of the original electric field and the electric field due to the redistributed charged particles. Since they are oppositely directed, the two contributions to the electric field inside the conductor tend to cancel each other. Now comes the profound part of the argument: the two contributions to the electric field at any point in the conductor exactly cancel. We know they have to completely cancel because, if they didn’t, the free-to-move-charge in the conductor would move as a result of the force exerted on it by the electric field. And the force on the charge is always in a direction that causes the charge to be redistributed to positions in which it will create its own electric field that tends to cancel the electric field that caused the charge to move. The point is that the charge will not stop responding to the electric field until the net electric field at every point in the conductor is zero.

The electric field is zero at all points inside the conductor, and, while the total charge is still zero, the charge has been redistributed as in the following diagram:

These charges which are appearing on the surface are called induced charges. Due to these induced charges, the electric field will be produced and that is the induced electric field.

The direction of this electric field will be from positive to negative.

$E_{net}= E_{in}+ E_{ext}$

and $E_{net}= 0$ inside the conductor.

now if we make a gaussian surface inside the conductor

We know that Einside =0

Therefore, $\phi =\oint E \cdot ds=\frac{q_{inside}}{\epsilon _{0}}=0$

Hence, $q_{inside}=0$ charge inside the conductor zero.

Applications of Gauss Law(III)

Applications of Gauss Law(III):

Electric field due to cylinders :

1. Solid conducting/ hollow conducting

The electric field of an infinite cylindrical conductor with a uniform linear charge density can be obtained by using gauss' law . Considering a Gaussian surface in the form of a cylinder at radius r > R, the electric field has the same magnitude at every point of the cylinder and is directed outward. The electric flux is then just the electric field times the area of the cylinder.

when the charge is on the surface we need to take account of the surface charge density.

$\sigma =\frac{\text{charge}}{\text{area}}$

For a uniformly charged cylinder of radius, R. We have to consider these three areas where

a) Inside the cylinder (r<R)

b) At the surface (r=R)

c) outside the cylinder (r>R).

(a). Inside (r<R)

E =0

(b). Outside (r>R)

$E=\frac{\sigma R}{\epsilon _{0}r}$

(c). At the surface (r=R)

$E=\frac{\sigma }{\epsilon _{0}}$

2. Solid non-conducting

In the case of a solid non-conducting cylinder, the charge is not only on the surface but also distributed through whole volume. Therefore, volume charge density, $\rho = \frac{\text{charge}}{\text{volume}}$

(a). Inside (r<R)

$E = \frac{\rho r}{2\epsilon _{0}}$

(b). Outside (r>R)

$E=\frac{\rho R^2}{2\epsilon _{0}r}$

(c). At the surface (r=R)

$E=\frac{\rho R }{2\epsilon _{0}}(\text{max.})$

Applications of Gauss Law(IV)

FIeld of an infinite plane sheet -

It is one of the very important case and we are going to find the electric field of an infinte plane sheet with the help of Gauss's law -

Let us consider a thin, flat, infinite sheet which consists of uniform positive charge per unit area $\sigma$ . We can see that there is symmetry in this lamina. So, to take advantage of these symmetry properties, we use a cylinder as our Gaussian surface whose axis is perpendicular to the sheet of charge, with ends of area A .

We can also observe that the charged sheet passes through the middle of the cylinder's length and because of this flux through each end is EA. This is because $\vec{E}$ is perpendcular to the charged sheet and area vector too. The $\vec{E}$ is perpendicular to the curved surface so, flux will be zero through this. Then the total flux will be 2EA. Now the net charge within the the Gaussian surface can be calculated as -

$Q_{enclosed} = \sigma A$

So we can write that by Gauss's law -

$2EA = \frac{\sigma A}{\varepsilon_o}$

$E = \frac{\sigma }{2 \varepsilon_o}$

If the charge is negative , $\vec{E}$ will be toward the sheet.

Since in this nature nothing is infinitely large, but this assumption is valid if we placed a unit point charge in front of large sheet.

Applications of Gauss Law(V)

Electric field due to uniform charged sphere-

Sphere may be hollow or solid and both hollow and solid sphere mey be conducting or non-conducting. So let us know the electric field due to all these cases -

In case of conducting sphere, whole charge will come on the surface of the sphere but when the sphere is non-conducting then the whole charge is distributed all over the sphere.

Electric field due to hollow conducting/ Non-conducting and solid conducting sphere -

1. For a point outside the sphere -

$\\ \begin{array}{l}{\text { We first consider the field outside the conductor, so we choose }} {r>R . \text { The entire conductor is within the Gaussian surface, so the }} \\ {\text { enclosed charge is } q \text { . The area of the Gaussian surface is } 4 \pi r^{2} \text { ; }} \\ {\vec{E} \text { is uniform over the surface and perpendicular to it at each point. }} {\text { The flux integral } \oint E_{\perp} d A \text { in Gauss's law is therefore } E\left(4 \pi r^{2}\right)} \\ {\text { which gives }} \\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ {\qquad E\left(4 \pi r^{2}\right)=\frac{q}{\varepsilon_{0}}} \\ \\ {\text { or, } \quad E=\frac{1}{4 \pi \varepsilon_{0}} \frac{q}{r^{2}} \quad \text { (outside a charged conducting sphere) }}\end{array}$

For all points outside the shell, field due to uniformly charge shell is such that the entire charge is concentrated at the center of shell.

2. For a point inside the sphere (r<R) -

Since charge will be zero in this case for hollow sphere and conducting solid sphere. So, E = 0 in inside the sphere.

3. At surface (r = R)

$E=\frac{1}{4 \pi \varepsilon_{0}} \frac{q}{R^{2}}$

Electric field due to solid non-conducting -

1. Outside (r>R)

$E = \frac{\rho R^3}{3 \varepsilon_or^2}$

2. Inisde (r<R) -

$E = \frac{\rho r}{3 \varepsilon_o}$

Study it with Videos

Gauss law

Applications of Gauss Law(I)

Applications of Gauss Law(II)

Applications of Gauss Law(III)

Applications of Gauss Law(IV)

Applications of Gauss Law(V)

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