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Q.

A long cylindrical wire of radius ‘a’ carries a current distributed uniformly over its cross section if the magnetic fields at distances 2 cm (< a) and 8 cm (> a) have equal magnitude, then

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answer is 4.

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Detailed Solution

At r=2​cm, B1=μ02(iπa2)×2 unitand at r=8 cm, B2=μ0i2π×8Since B1=B2, μ0i2πa2×2=μ0i2π×8⇒a=4 cm
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