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Moving Charges And Magnetism

Question

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A wire of length 2m carries a current of 1 ampere is bend to form a circle. The magnetic moment of the coil is
$2 π$
$π / 2$
$π / 4$
$1 / π$

Solution

D.

1 / π

Some More Questions From Moving Charges And Magnetism Chapter

Two moving coil meters, M₁ and M₂ have the following particulars:
R₁ = 10 Ω N₁ = 30,
A₁ = 3.6 x 10^–3 m², B₁ = 0.25 T
R₂ = 14 Ω; N₂ = 42,
A₂ = 1.8 x 10^–3 m², B₂ = 0.50 T
(The spring constants k are identical for the two meters).
Determine the ratio of (a) current sensitivity and (b) voltage sensitivity of M₂ and M_1.

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