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NEET Physics QUESTION #1065
Question 1
A 2 A current flows through two circular coils with radii ratio 1:2. Ratio of their magnetic moments is:
  • 2:1
  • 4:1
  • 1:4✔️
  • 1:2
Correct Answer Explanation
Magnetic moment \(\mu = IA = I\pi r^2\). Same current \(I\). Ratio: \(\frac{\mu_1}{\mu_2}=\frac{r_1^2}{r_2^2}=\frac{1^2}{2^2}=\frac{1}{4}\). So \(\mu_1:\mu_2=1:4\).