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Q.

Consider a coxial cable which consists of an inner wire of radius a surrounded by an outer shell of inner and outer radii b and c, respectively. The inner wire carries a current I and outer shell carries an equal and opposite current. The magnetic field at a distance x from the axis where b<x<c is

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a

μ0Ic2-b22πxc2-a2

b

μ0Ic2-x22πxc2-a2

c

μ0Ic2-x22πxc2-b2

d

zero

answer is C.

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Detailed Solution

Bx=μ02πIinx

where,   Iin=IIπc2-b2πx2-b2

                  =Ic2-x2c2-b2

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