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Q.

Consider a coaxial cable which consists of an inner wire of radius a surrounded by an outer shell of inner and outer radii band c, respectively. The inner wire carries a current I and the outer shell carries an equal current in opposite direction.

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a

Both are correct

b

for x<a, B=μ0Ix2πa2

c

for a<x<b, B=μ0I2πx

d

Both are wrong

answer is C.

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Detailed Solution

Apply Ampere's circuital law,

∮B·dI=μ0inet ∴   Bl=μ0inet

or    B2πx=μ0inet

∴   B=μ02πinetx

Find inet for different regions.

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