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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 uniform vertical electric field ` vec E=`
` .

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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