Verified Solution • 2025–26 Session moderate

QNEET-2017-Ph-995: NEET 2017 Physics - Class 12 NEET-2017-Ph-995 Solution: A 250-turn rectangular coil of length 2.1 cm and width 1.25 cm…

A 250-turn rectangular coil of length 2.1 cm and width 1.25 cm carries a current of

85\mu A

and subjected to a magnetic field of strength 0.85 T. Work done for rotating the coil by

180^\circ

against the torque is

4.55\mu J

2.3\mu J

1.15\mu J

9.1\mu J

Multiple Choice Options

A 4.55 $\mu$ _ J
B 2.3 $\mu$ _ J
C 1.15 $\mu$ _ J
D 9.1 $\mu$ _ J

Step-by-Step Verified Solution

Given: n = 250, l = 2.1 cm, W = 1.25 cm, i = 85 _A, B = 0.85 T Now W = MB (cos _ 1 � cos _ 2 ) = 2MB = 2(iNA)B = 2 _ 85 _ 10 �6 _ 250 _ 2.1 _ 1.25 _ 10 �4 _ 0.85 = 9.1 _ 10 �6 J

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