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Magnetic Flux MCQ - Practice Questions with Answers

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

Quick Facts

  • Magnetic flux is considered one of the most asked concept.

  • 13 Questions around this concept.

Solve by difficulty

In the figure there is a ring of area A=10 m2 is kept in a constant magnetic field B of intensity 1 Tesla
What will be the net flux through the surface?

A square loop of side 1 m ad resistance 1Ω is placed in a magnetic field of 0.5 T . If the plane of the loop is perpendicular to the direction of the magnetic field, the magnetic flux through the loop is :

F(0,0,5). The magnetic field in this region is B=(3i^+4j^)T. The quantity of flux through the loop ABCDEFA (in Wb) is:-

 

 

A person wants to roll a solid non-conducting spherical ball of mass m and radius r on a surface whose coefficient of static friction is μ. He placed the ball on the surface wrapped with n turns of closely packed conducting coils of negligible mass at the diameter. By some arrangement, he is able to pass current I through the coils either in the clockwise direction or in the anti-clockwise direction.

A constant horizontal magnetic field B is present throughout the space as shown in the figure. (Assume B is large enough to help rolling motion)

Question

If current i is passed through the coils the maximum torque in the coil is

 

Write–Up–II
A person wants to roll a solid non-conducting spherical ball of mass m and radius r on a surface whose coefficient of static friction is μ. He placed the ball on the surface wrapped with n turns of closely packed conducting coils of negligible mass at the diameter. By some arrangement he is able to pass current i through the coils either in the clockwise direction or in the anti-clockwise direction.

A constant horizontal magnetic field B is present throughout the space as shown in the figure. (Assume μ is large enough to help rolling motion)

Question

Angular acceleration of the ball after it has rotated through an angle θ(θ<180) , is

Write–Up–II

A person wants to roll a solid non-conducting spherical ball of mass m and radius r on a surface whose coefficient of static friction is μ. He placed the ball on the surface wrapped with n turns of closely packed conducting coils of negligible mass at the diameter. By some arrangement he is able to pass a current i through the coils either in the clockwise direction or in the anti-clockwise direction.

A constant horizontal magnetic field B is present throughout the space as shown in the figure. (Assume B is large enough to help rolling motion)

Question

The minimum value of μ for which the rolling motion is possible, is

 

Directions: Study the following line chart carefully and answer the questions given beside.
The following Graph shows the ratio values of a mixture of Propane and Butane in 5 vessels A, B, C, D, E.
(For example, the Ratio of Propane and Butane in vessel A is 30 : 12)

In what ratio must mixture in the vessel C and D be mixed to get the final ratio 115: 81 of Propane and Butane?

Concepts Covered - 1

Magnetic flux

Magnetic flux-

The total number of magnetic lines of force passing normally through an area placed in a magnetic field is equal to
the magnetic flux linked with that area.

I.e for the below figure

Net magnetic flux through the surface is given by

ϕB=BdA=BAcosΘ

where
ϕB= Magnetic Flux

B= Magnetic field 

Θ= The angle between area vector and magnetic field vector

 

 

  • Magnetic flux is a scalar quantity.
  • Unit of magnetic flux -

It's S.I. unit is Weber (wb) or Tesla ×m2 and its C.G.S. unit is maxwell(Mx).
and 1wb=1Tm2 and 1Mx=108wb
- The dimension of magnetic flux is ML2T2A1
- if θ=0 then ϕ=BA and Flux will be positive.
- If θ=π2 then Flux will be zero (i.e ϕ=0 )

 

 

 

 

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