A closely wound solenoid of $2000$ $turns$ and area of cross-section  $1.5 \times 10^{-4}\ m^2$ carries a current of $2.0\, A.$ It is suspended through its centre and perpendicular to its length, allowing it to turn in a horizontal plane in a uniform magnetic field $5 \times 10^{- 2}$ $tesla$ making an angle of $30^o $ with the axis of the solenoid. The torque on the solenoid will be 
  • A$3 \times  10^{-3}\ Nm$
  • B$1.5 \times 10^{-3}\ Nm$
  • C$1.5 \times  10^{-2}\ Nm$
  • D$3 \times  10^{-2}\ Nm$
AIPMT 2010, Medium
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