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Transcribed Image Text:4. A long coaxial cable, crossection of which is shown in the figure, is
made up of a cylindrical inner wire of radius a and a cylindrical shell
shaped coaxial outer wire of inner radius b and outer radius c. The
r2
current density with magnitude J = K- is spread over the cross section
of the inner wire where the current has out-of-page direction. Outer wire
carries uniformly distributed current i = tka³ having into-the-page
direction.
a) Find the total current of the inner wire iin in terms of i.
Find expressions for the magnitude of magnetic field,
b) inside the inner wire (r < a)
c) between the wires (a <r < b)
d) inside the outer wire (b <r<c)
e) outside the outer wire (r > c)
in terms of µo, i, TI and r. For each case indicate the direction of the magnetic field as well.
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Given,
b. Since, we know Ampere's Law
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