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Moving Charges And Magnetism

Question

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What is the magnetic moment associated with a coil of 1 turn, area of cross-section 10^–4m² carrying a current of 2A?

Solution

Number of turns, n = 1
Area of cross section, A = 10^-4 m²
Current , I =2 A
Magnetic moment assosciated with the coil is,

m= nIA
= 1

\times 2 \times 10^{- 4}

= 2

\times 10^{- 4} {Am}^{2}

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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