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A small sphere of mass m=2gm having char...

A small sphere of mass `m=2gm` having charge `Q=50muC` is suspended using an insulated string as shown in figure. The angle. The angle `theta` made by the sphere with vertical if it is placed in an electric field of magnitude `200v//m` towards right is : (A) `tan^(-1)(5)` (B) `tan^(-1)(0.5)` (C) `tan^(-1)(2)` (D) `tan^(-1)(0.2)`

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