A small sphere of mass m and having charge q is suspended by a light thread.

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Tension in the thread may reduce to zero if another charged sphere is placed vertically below it.

tension in the thread may increase to twice of its original value if another charged sphere is placed vertically below it

tension in the thread is always equal to mg.

tension in the thread is greater than mg if another charged sphere is held in the same horizontal line in which first sphere stays in equilibrium.

answer is A, B, C.

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Detailed Solution

When there is a charge of same nature placed below the sphere, there will be a force acting upwards.

So the tension in the string will decrease.

And similarly if a charge of opposite nature is placed there will be attraction and the tension in the string will be increased. ( magnitude depends on the magnitude of charge)

And if there is a charge placed on the same horizontal line, the tension in the string will be the resultant of weight and electric force. So the magnitude of tension will be more than weight and more than electric force)

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