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Class 12 › Physics › Moving Charges and Magnetism
CBSE2020Class Class 12 · Physics2 Marks · Short✅ Verified
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 current appears clockwise to an observer. Find the magnitude and direction of the magnetic moment vector.
✅ Answer & Solution
Magnetic moment:
$$M = IA = 12 \times 7.5 \times 10^{-4} = 9 \times 10^{-3} \text{ A·m}^2$$
Direction: By right-hand rule, if current appears clockwise to the observer, the magnetic moment $\vec{M}$ points away from the observer (into the plane, away from the observer's side).
