A rectangular loop of length 20 cm, along y -axis and breadth 10 cm along z-axis carries a current of 12 A. If a uniform magnetic field (0.3 
+ 0.4 
) acts on the loop, the torque acting on it is
Text Solution
Verified by ExpertsThe correct answer is:
C
Area of loop = 20 × 10 = 200 cm 2
= 2 × 10 –2 m 2
= (2×10 –2 m 2 ) 
(as loop is in yz plane).
so. 
= 
i ( 
) = 1
= 12 × 2 × 10 –2 ( 
) × (0.3 
+ 0.4 
)
= 12 × 2 × 0.4 × 10 –2 × 10 –2 ( 
) = 9.6 × 10 –2 
(Nm)
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