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A positively charged thin metal ring of ...

A positively charged thin metal ring of radius R is fixed in the xy plane with its centre at the origin O. A negatively charged particle P is released from rest at the point (0, 0, `z_0`) where `z_0gt0`. Then the motion of P is

A

periodic for all the values of `z_0` satisfying `o lt Z_0 lt infty`

B

simple harmonic for all the values of `z_0` satisfying `0ltz_0 leR`

C

approximately simple harmonic, provided `Z_0ltltR`

D

such that P crosses O and continues to move along the negative Z-axis towars `z = - infty`.

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