A uniform magnetic field of 0.3 T is established along the positive Z-direction. A rectangular loop in XY plane of sides 10 cm and 5 cm carries a current of I =12 , A as shown. The torque on the loop is :

1. A. +1.8 10 -2 , i , NM
2. B. -1.8 10 -2 , j , NM
3. C. Zero
4. D. -1.8 10 -2 , i , NM

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