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 $E =$
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 $E =$
- A
$\frac{{mg}}{q}$
- B
$\frac{{mg}}{{2q}}$
- C
$\frac{{mg\,\tan \theta }}{{2q}}$
- D
none
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