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A solenoid of 2.5 metre length and 2.0 c...

A solenoid of 2.5 metre length and 2.0 cm diameter possesses 10 turns per cm. A current of 0.5 ampere is flowing through it. The magnetic induction at axis inside the solenoid is :

A

`2 pi xx 10^-4` tesla

B

`2 pi xx 10^-5` tesla

C

`2 pi xx 10^-6` tesla

D

`2 pi xx 10^-7` tesla.

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