Home
Class 12
PHYSICS
A metal disc of radius a rotates with a ...

A metal disc of radius a rotates with a constant angular velocity `omega` about its axis. The potential difference between the center and the rim of the disc is `("m = mass of electron, e = charge on electro")`

A

`(momega^(2)a^(2))/(e)`

B

`(1)/(2)(momega^(2)a^(2))/(e)`

C

`(momega^(2)a^(2))/(2m)`

D

`(momega^(2)a^(2))/(m)`

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Similar Questions

Explore conceptually related problems

A metal disc of radius R = 25 cm rotates with a constant angular velocity omega = 130 rad s^(-1) about its axis. Find the potential difference between the center and rim of the disc if (a) the external magnetic field is absent, (b) the external uniform megnetic field B = 5.0 mT directed perpendicular to the disc.

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 ):

A heavy disc is rotating with uniform angular velocity omega about its own axis. A piece of wax sticks to it. The angular velocity of the disc will

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 disc rotates with angular velocity omega and kinetic energy E . Then its angular momentum

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 disc of radius R rotates with constant angular velocity omega about its own axis. Surface charge density of this disc varies as sigma = alphar^(2) , where r is the distance from the centre of disc. Determine the magnetic field intensity at the centre of disc.

A disc rotates with constant angular velocity. Doesa point on its rim have a tangential acceleration or a radial acceleration ? Are these accelerations constant ? '

A uniform heavy disc is rotating at constant angular velocity omega about a vertical axis through its centre and perpendicular to the plane of the disc. Let L be its angular momentum. A lump of plasticine is dropped vertically on the disc and sticks to it. Which of the following will be constant?

A circular disc of radius 20 cm is rotating with a constant angular speed of 2.0 rad//s in a uniform magnetic field of 0.2 T. Find the e.m.f. induced between the centre and rim of the disc. Given magnetic field is along the axis of rotation of disc.