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A long straight metal rod of radius 4 cm carries 2A, uniformly distributed over its circular cross section. Find the magnetic field induction at a distance 3 cm from the axis of the wire.
current through the 4cm cross section is 2A so the current through the 3cm cross section will be (3/4)*2 ampere now make a circular loop and using the ampere circutal law
B*2*pie*0.03=mu not times (3/4)*2
instead of B all the quantities are known hence B can be easily found.
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