A potentiometer wire AB as shown in 40 c...

A potentiometer wire AB as shown in 40 cm long of resistance `50Omega//m` free end of an ideal galvanometer is touching the potentiometer wire with the help of a jockey. What should be the velocity of the jockey as a function of time so that potential difference across the galvanometer is varying with time as `(2sinpit)V`

`(10pisinpit)cm//s`

`(10picospit)cm//s`

`(20pisinpit)cm//s`

`(20picospit)cm//s`

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