Find the resistance of an annular wedge of conducting material, assuming the current flow is radial as shown at right. The wedge spans an angle and has an inner radius a and outer radius b. The material has a conductivity thickness t, and perfect ohmic contacts can be assumed. Hint: there is only a radial and component of the current and hence only a radial component of the electrical field, J = J¸(r)î=0E¸(r)î, so the starting point is Laplace's equation 1 d V.J=0 ⇒ V²: =0 rər ӘФ Ər r. I + G b

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Magnetic Moment

The magnetic moment is defined as the alignment of a magnet and its strength when the magnet is creating a magnetic field. There are number of examples of the magnetic moment, few are a current carrying conductor in the form of coil, elements at microscopic levels like electrons and many more.