Question

A solenoid of cross-sectional area 2 x 10-4 m2 and
900 turns has 0.6 A m² magnetic moment. Then
the current flowing through it is
(a) 2.24 A
(b) 2.34 mA
(c) 3.33 A
(d) 3.33 mA

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Answer 1

Answer: correct option is C. 3.33A

here, N =900 turns,

A=2×10-⁴m²,ms = 0.6Am²

the magnetic movement of the solenoid

ms = NIA

I = ms/NA = 0.6/900×2×10-⁴ = 3.33A

hence, the correct option is (c)