1.

A cylinderical cavity of diameter a exists inside a cylinder of diameter 2a as shown in the figure. Both the cylinder and the cavity are infinitely long. A uniform current density J flows along the length. If the magnitude of the magnetic field at the point P is given by `(N)/(12)mu_(0)aJ`, then the value of N is A. 5B. 6C. 7D. 4

Answer» Correct Answer - B


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