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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 tantheta//2q`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
B

Balancing torque abot `-q` is
`qE2Rsintheta=mg sintheta R` or `E=(mg)/(2q)`
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