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A solenoid 1.5 m long and 0.4 cm in diam...

A solenoid 1.5 m long and 0.4 cm in diameter possesses 10 turns per cm length. A current of 5 A falls through it. The magnetic field at the axis inside the solenoid is

A

`4pi xx 10^-2T`

B

`2pi xx 10^-2T`

C

`2pi xx 10^-3T`

D

`4pi xx 10^-3T`

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