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One end of a string of length l is conne...

One end of a string of length l is connected to a particle of mass m and the other to a small peg on a smooth horizontal table. If the particle moves in a circle with speed u the net force on the particle (directed towards the centre) is

A

T

B

`T-(mv)/t`

C

`T+ (mv)/1`

D

0

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The correct Answer is:
A
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A particle of mass 'm' is attached to one end of a string of length 'l' while the other end is fixed to a point 'h' above the horizontal table, the particle is made to revolve in a circle on the table, so as to make P revolution per sec. The maximum value of P if the particle is to be contact with the table is