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Electromagnetism — Easy JEE physics MCQ

A circular loop of radius $7$ cm carries a current of $2$ A. Its magnetic moment is:
  1. A. $3.08 \times 10^{-2}$ A·m²
  2. B. $0.88$ A·m²
  3. C. $0.44$ A·m²
  4. D. $6.16 \times 10^{-2}$ A·m²

Solution

$M = IA = I\pi r^2 = 2 \times \pi \times (0.07)^2 = 2 \times 3.14 \times 0.0049 \approx 3.08 \times 10^{-2}$ A·m²

PHYSICS

easy • PYQ Reworded
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A circular loop of radius 77 cm carries a current of 22 A. Its magnetic moment is:
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Electromagnetism — Easy JEE Physics MCQ | MyGoalPrep