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A uniform circular metal disc of radius ...

A uniform circular metal disc of radius `R` is rotating about a vertical axis passing through its centre and perpendicular to its plane with constant frequency f. If `B_(H)` and `B_(V)` are horizontal and vertical components of the Earth's magnetic field respectively, then the induced e.m.f between its centre and the rim is

A

`pi B_vfR^2`

B

`piB_HfR^2`

C

`2piB_vfR^2`

D

zero

Text Solution

Verified by Experts

The correct Answer is:
A
`e=1/2BR^2omega" where "omega=2pif`
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