Home
Class 12
PHYSICS
A conducting disc of radius R is placed ...

A conducting disc of radius `R` is placed in a uniform and constant magnetic field `B` parallel to the axis of the disc.With what angular speed should the disc be rotated about its axis such that no electric field develops in the disc (the electric charge and mass are `e` and `m`)

A

`(eB)/(2m)`

B

`(eB)/(m)`

C

`(2pim)/(eB)`

D

`(pim)/(eB)`

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Similar Questions

Explore conceptually related problems

A brass disc is rotating about its axis. If temperature of disc is increased then its

A conducting disc of radius r rotaes with a small but constant angular velocity omega about its axis. A uniform magnetic field B exists parallel to the axis of rotation. Find the motional emf between the centre and the periphery of the disc.

A non-conducting thin disc of radius R charged uniformly over one side with surface density sigma , rotates about its axis with an angular velocity omega . Find (a) the magnetic field induction at the centre of the disc (b) the magnetic moment of the disc.

A uniform disc of mass M and radius R is hinged at its centre C. A force F is applied on the disc as shown. At this instant, the angular acceleration of the disc is

A uniform disc of mass M and radius R is hinged at its centre C . A force F is applied on the disc as shown . At this instant , angular acceleration of the disc is

When a circular disc of radius 0.5 m is rotating about its own axis, then the direction of its angular momentum is

A non-conducting thin disc of radius R and mass m having charge uniformly over one side with surface density sigma rotates about its axis with an angular velocity omega . Find : (a) the magnetic induction at the centre of the disc, (b) the magnetic moment of the disc. ( c) the ratio of magnetic moment and angular momentum of disc.

A quarter disc of radius R and mass m is rotating about the axis OO' (perpendicular to the plane of the disc) as shown. Rotational kinetic energy of the quarter disc is

a conducting disc of radius R roatates about its axis when an angular velocity omega .Then the potential difference between the centre of the disc and its edge is (no magnetic field is present ):