A wheel having mass m has charges +q and -q on diametrically opposite points. It remains in equilibr

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1. Electric Charges and Fields

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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

Solution

Balancing torque abot $-q$ is

$q E 2 R \sin \theta=m g \sin \theta R$ or $E=\frac{m g}{2 q}$

Standard 12

Physics

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