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A long solenoid of 50 cm length having 1...

A long solenoid of 50 cm length having 100 turns carries a current of 2.5A. The magnetic field at centre of solenoid is:

A

`6.28 x 10^-4 T`

B

`3.14 x 10^-4 T`

C

`6.28 x 10^-5 T`

D

`3.14 x 10^-5 T`

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