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A positively charged disc is placed on ...

A positively charged disc is placed on a horizontal plane. A charged particle is released from a certain height on its axis. The particle just reaches the centre of the disc. Select the correct alternative.

A

Particle has negative charge on it

B

Total potential energy (gravitational+ electrostatic) of the particle first increases then decreases

C

Total potential energy of the particle first decreases then increases

D

Total potential energy of the particle continuously decreases

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