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X and Y are two loops made from same wire. The radii of X and Y are r1 and r2 and their M.I. are I1 and I2. If I2/I1=4 the value of r2/r1 is (K)13. Find the value of K.

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answer is 4.

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Detailed Solution

I=MR2=(2πRAρ)R2⇒I∝R3⇒R∝I1/3∴R2R1=(I2I1)1/3=(41)1/3

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