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A wheel having mass m has charges +q and...

A wheel having mass m has charges `+q` and `-q` on diametrically opposite points. It remains in equilibrium on a rough inclined plane in the presence of a uniform vertical electric field E. The value of E is

A

`(mg tan theta)/(q)`

B

`(mg)/(q)`

C

`(mg)/(2q)`

D

`(mg tan theta)/(2q)`

Text Solution

Verified by Experts

The correct Answer is:
C
`t_(1)=t_(2)`
`q(2R) E sin theta= mg R sin theta`
`E=(mg)/(2q)`
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