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

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 vertical electric field E. Then value of E is ......

A

`(mg)/q`

B

`(mg)/(2q)`

C

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

D

None

Text Solution

Verified by Experts

The correct Answer is:
B

For rotational equilibrium, `sum tau_(p)=0`
`rArr mga cos alpha-qE (2a cos alpha)=0rArr E=(mg)/(2q)`
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