A neutral conducting rod is kept along at axis of a fixed uniformly charged ring as shown in figure, then

net force on rod is towards ring.

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net force on rod may be away from the ring.

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net force on rod may be zero.

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rod will perform oscillatory motion.

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Solution

The correct options are
B net force on rod may be away from the ring.
C net force on rod may be zero.
Field due to ring is $E = \frac{k Q x}{(x^{2} + R^{2})^{\frac{3}{2}}}$
where k is $\frac{1}{4 {πε}_{0}}$ .

Charge induced on rod is

It depends on position of rod that net force on its induced charges is in which direction.

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