Question bank/NEET UG/Physics

NEET UGPhysicsModerateNEET 2025

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

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Sol. Magnetic moment of current carrying circular loop = IA
M=IAM = IA
M∝AM \propto A [I–Same]
M1M2=A1A2=πr12πr22=(r1r2)2=(12)2=14\frac{M_1}{M_2} = \frac{A_1}{A_2} = \frac{\pi r_1^2}{\pi r_2^2} = (\frac{r_1}{r_2})^2 = (\frac{1}{2})^2 = \frac{1}{4}

Source: geekyrakshit/indian-exam-questions / neet2025-code45

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