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Electric Field MCQ - Practice Questions with Answers

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

Quick Facts

  • Electric field is considered one of the most asked concept.

  • 31 Questions around this concept.

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If a charge  q is placed at the centre of the line joining two equal charges Q  such that the system is in equilibrium then the value of q is 

Concepts Covered - 1

Electric field

Electric field

Electric field and electric lines of force:

The space around a charge in which another charged particle experiences a force is said to have an electric field in it. 

Electric Field Intensity: 

The electric field intensity at any point is defined as the force experienced by a unit positive charge placed at that point.

                                                                     

Electric field intensity,

               E=\frac{F}{q_0}

where F is the force experienced by q0. The SI unit of E is,

\frac{Newton}{Columb}=\frac{Volt}{meter}=\frac{Joule}{Coulomb\times Meter}

The dimensional formula is [MLT^{-3}A^{-1}] 

The electric field is a vector quantity and due to positive charge is away from the charge and for the negative charge, it is towards the charge.

Electric field due to a point charge: 

                                                                        

Consider a point charge placed at the origin O. Let a test charge q0 is placed at P which is at a distance r from O. Force F on test charge q0 is

                                                              F=\frac{1}{4\pi \epsilon_0}\frac{qq_0}{r^2}\hat r

The electric field at point P due to q is

                      E=\lim_{q_0\rightarrow 0}\frac{F}{q_0}=\lim_{q_0\rightarrow 0}\frac{1}{q_0}\frac{1}{4\pi \epsilon_0}\frac{qq_0}{r^2}\hat r=\frac{1}{4\pi \epsilon_0}\frac{q}{r^2}\hat r

(As qo tends to zero the electric field produced by q is not affected by qo.)

The magnitude of the electric field 

                                                 E=\frac{1}{4\pi \epsilon_0}\frac{q}{r^2}

Electric field due to a system of charge:

Electric field obeys the superposition principle. That is the electric field due to a system of charge at a point is equal to the vector sum of all the electric fields. 

 

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Electric field

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