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Q.

A wire of radius R having a uniform cross-section carrying a steady current i. The variation of the magnetic field as function of distance r from the axis of wire is correctly represented by

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a

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b

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c

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d

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answer is B.

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Detailed Solution

 For r<R

B=μ0Ir2πR2

⇒B∝r

and for r > R

B=μ0I2πr⇒B∝1r

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