Consider thr long (L>>b) cylindrical shell of inner radius a=R and outer radius b=3R as shown in the figure. The current I=3A is uniformly distributed over the cross section of the wire. Here R=1.8cm What is the magnitude of the magnetic field, in units of microtesla at distance 2R? (μ⁰=4π*10e-7T*m/A)
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