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A planar loop of irregular shape encloses an area of $7.5 \times 10^{- 4} m^{2}$ and carries a current of 12 A. The sense of flow of current appears to be clockwise to an observer. What is the magnitude of the magnetic moment vector associated with the current loop?

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$5.6 \times 10^{- 3} J T^{- 1}$

$7.5 \times 10^{- 3} J T^{- 1}$

$3.6 \times 10^{- 3} J T^{- 1}$

$9.0 \times 10^{- 3} J T^{- 1}$

answer is D.

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Detailed Solution

$A = 7.5 \times 10^{- 4} m^{2}$

$\begin{aligned} I = 12 A \\ M = I A = 12 \times 7.5 \times 10^{- 3} \\ = 9 \times 10^{- 3} {JT}^{-1} \end{aligned}$

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