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The torque required to hold a small circ...

The torque required to hold a small circular coil of 10 turns ,area 1 `mm^(2)` and crying a current of `((21)/(44))`A in the middle of a long solenoid of `10^(3)` turns/m carrying a current of 2.5 A, with its axis perpenducular to the axis of the solenoid is

A

`1.5 xx 10^+9 N-m`

B

`1.5 xx 10^-9 N-m`

C

`1.5 xx 10^-8 Nm`

D

`1.5 xx 10^-6 N-m`.

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