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Question: A closely wound solenoid of 3000 turns and area of cross section 2 x 10-4 m2, carrying a current of ...

A closely wound solenoid of 3000 turns and area of cross section 2 x 10-4 m2, carrying a current of 6 A is suspended through its centre allowing it to turn in a horizontal plane. The magnetic moment associated with this solenoid is

A

1.2 J T−11.2 \mathrm {~J} \mathrm {~T} ^ { - 1 }

B

2.4 J T−12.4 \mathrm {~J} \mathrm {~T} ^ { - 1 }

C

3.0 J T−13.0 \mathrm {~J} \mathrm {~T} ^ { - 1 }

D

3.6 J T−13.6 \mathrm {~J} \mathrm {~T} ^ { - 1 }

Answer

3.6 J T−13.6 \mathrm {~J} \mathrm {~T} ^ { - 1 }

Explanation

Solution

: Here, , N=3000, A=2×10−4 m2,I6 A\mathrm { N } = 3000 , \mathrm {~A} = 2 \times 10 ^ { - 4 } \mathrm {~m} ^ { 2 } , \mathrm { I } 6 \mathrm {~A}