Write the formula for the magnetization volume current density J M and magnetization surface current density JMS in terms of magnetization vector M. 4. A sphere has permanent magnetization where is a positive constant. Find JMS. Figure on the right shows an infinite conducting sheet on the x-y carrying a uniform surface current Js as indicated. Use the figure to the right to calculate the magnitude of the H-field in terms of Js. Which law of magnetostatics did you use? 6. In medium1 just above the xy-plane the H-field is given as H1= . Obtain an expression for H2 in medium2 just below the xy-plane, in terms of the parameters given.