Exercise 3

Determine the magnetic field at the point P for the two geometries shown in the figures below.

\includegraphics{fig3.26.eps}

 

                                                                                               [Ans . (a) $\mu_0I/4R$(b) $\displaystyle{\frac{\mu_0 I(R_1-R_2)\theta}{4\pi R_1R_2}}$]