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Q.

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 =

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a

mgq

b

mg2q

c

mg tanθ2q

d

none

answer is B.

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Detailed Solution

mgsinθ = f 

taking torque about center of mass,

 fr = pE sinθ

⇒mgsin⁡θr=Eq⋅(2r)sin⁡θ⇒E=mg2q

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