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Two point charge +q and -q are fixed on ...

Two point charge +q and -q are fixed on diameterically opposite point on the unirom ring, such that -q is at bottom and is contact will a perfect insulator incline plane. Total mass is equal to m remains in equilibrium on the rough inclined plane in the presence of uniform vertical electric field. Then

A

the value of friction force is `mg sin theta`

B

the value of friction force is less than `mg sin theta`

C

the value of electric field is `(mg)/(2q)`

D

the value of electric field is `(mg tan theta)/(2q)`

Text Solution

Verified by Experts

The correct Answer is:
A, C
`f = mg sin theta`
and
`PE sin theta = mg sin theta R`
`q 2R E sin theta = mg sin theta R`
`E = (mg)/(2q)`.
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