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Current Loop as a Magnetic Dipole question from NEET 2025

Q19NEET 2025Easy

Current Loop as a Magnetic Dipole

A 2 amp current is flowing through two different small circular copper coils having radii ratio 1:21 : 2. The ratio of their respective magnetic moments will be

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Answer: (c)

  1. m=Iπr2m = I\pi r^2, so for the same current m∝r2m \propto r^2.
  2. m1m2=(12)2=14\frac{m_1}{m_2} = \left(\frac{1}{2}\right)^2 = \frac{1}{4}
  3. So the answer is (c) 1 : 4.
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