Home
Class 12
PHYSICS
A circular wire of radius r rotates abou...

A circular wire of radius r rotates about its own axis with angular speed w in a magnetic field B perpendicular to its plane, then the induced e.m.f. is

A

`1/2Bromega^(2)`

B

`Bromega^(2)`

C

`2Bomegar^(2)`

D

Zero

Text Solution

Verified by Experts

The correct Answer is:
D

As no flux change therefore induced emf is 0.
Promotional Banner

Similar Questions

Explore conceptually related problems

A conducting circular loop of raidus r is rotated about its diameter at a constant angular velocity omega in a magnetic field B perpendicular to the axis of rotation. In what position of the loop is the inducedj emf zero?

A wire is bent to form a semi-circle of radius a. The wire rotates about its one end with angular velocity omega . Axis of rotation being perpendicular to plane of the semicircle. In the space, a uniform magnetic field of induction exists along the axis of rotation as shown. The correct statement is

A wire is bent to form a semicircle of the radius a. The wire rotates about its one end with angular velocity omega . Axis of rotation is perpendicular to the plane of the semicircle . In the space , a uniform magnetic field of induction B exists along the aixs of rotation as shown in the figure . Then -

A current (I) carrying circular wire of radius R is placed in a magnetic field B perpendicular to its plane. The tension T along the circumference of the wire is

A solid cylinder of mass M and radius R rotates about its axis with angular speed omega . Its rotational kinetic energy is

An infinite cylinder of radius r with surface charge density sigma is rotated about its central axis with angular speed omega . Then the magnetic field at any point inside the cylinder is

A circular disc is rotating about its own axis, the direction of its angular momentum is

A copper disc of radius 1m is rotated about its natural axis with an angular velocity 2 "rad"//"sec" in a uniform magnetic field 5 telsa with its plane perpendicular to the field. Find the emf induced between the centre of the disc and its rim.

A metal disc of radius R rotates with an angular velcoity omega about an axis perpendicular to its plane passing through its centre in a magnetic field B acting perpendicular to the plane of the disc. Calculate the induced emf between the rim and the axis of the disc.

A non-conducting disk of radius R is rotating about its own axis with constant angular velocity omega in a perpendicular uniform magnetic field B as shown in figure. The emf induced between centre and rim of disk is