2 radius TL Figure shows a neutral metal ball of mass 50 kg and m...

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2 radius TL Figure shows a neutral metal ball of mass 50 kg and m placed on an insulating horizontal surface An upward electric field of strength 5 10 N C exists in the space A stream of light ions is switched on at 0 The ions are incident on the ball from left side at a speed 2 10 m s The charge density of ion beam is 5 10 2 C m All charges incident on the ball are absorbed Friction is large enough to prevent any horizontal movement of the ball Neglect any effect of the electric field on the ion beam The time in second at which ball will rise up from the surface is 12 a 25 R E b 15

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