The torque required to hold a small circular coil of 10 turns, area \( 1 \mathrm{~mm}^{2} \) and...

The torque required to hold a small circular coil of 10 turns, area \( 1 \mathrm{~mm}^{2} \) and carrying a current of \( \left(\frac{21}{44}\right) \mathrm{A} \) in the middle of a long solenoid of \( 10^{3} \) turns/m carrying a current of \( 2.5 \mathrm{~A} \), with its axis perpendicular to the axis of the solenoid is
(a) \( 1.5 \times 10^{-6} \mathrm{~N} \mathrm{~m} \)                     
(b) \( 1.5 \times 10^{-8} \mathrm{~N} \mathrm{~m} \)
(c) \( 1.5 \times 10^{6} \mathrm{~N} \mathrm{~m} \)                       
(d) \( 1.5 \times 10^{8} \mathrm{~N} \mathrm{~m} \)