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 (in the shown position) on a rough inclined plane in the presence of a uniform vertical electric field E equal to

`(mg)/2`

`(mg"tan"theta)/(2q)`

`(mg)/(2q)`

`(mg"sin"theta)/(2q)`

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