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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)/q`

C

` ( mg tan theta)/(2 q`

D

none

Text Solution

Verified by Experts

The correct Answer is:
B
For equlibrium
Taking torque about point of contacy mgsin theta.` R=qE sin theta. 2R`

` E= (mg) /(2q)`.
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