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

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 tan theta)/(q)`

B

`(mg)/(q)`

C

`(mg)/(2q)`

D

`(mgtan theta)/(2q)`

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