Question
Question: A current i is uniformly distributed over the cross section of a long hollow cylindrical wire of inn...
A current i is uniformly distributed over the cross section of a long hollow cylindrical wire of inner radius R1 and outer radius R2. Magnetic field B varies with distance r from the axis of cylinder as-
A
B
C
D
Answer
Explanation
Solution
r < R1, B = 0 r > R2 , b = 
R1 < r < R2, B = 