An infinitely long hollow conducting cylinder with inner radius `(R )/(2)` and outer radius `R` carries a uniform current ra density along its length . The magnitude of the magnetic field , ` | vec(B)|` as a function of the radial distance `r` from the axis is best represented by
A
B
C
D
Text Solution
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The correct Answer is:
D
For ` r gt ( R )/(2) , B = 0 ` For `( R )/(2) le rlt R , ` B = ( mu_(0))/(2) [ r - ( R ^( 2)) /( 2 r )] J` For ` rgt R ` , ` B = (mu_(0)i)/(2 pi r)`
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MOVING CHARGES AND MAGNETISM
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