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Unformatted text preview: is J ? 4. A cd carries a uniform surface charge density . If the cd rotates at an angular velocity , what is the surface current density K at a distance r from the center of the cd? 5. Find the magnetic field at the center of a square loop that carries a steady current I . Assume R is the perpendicular distance from the center of the loop to a side. 6. Calculate the magnetic field B at point P for the steady current configuration shown. 7. Calculate the force on the square loop placed near an infinite straight wire as shown. Both the loop and the straight wire carry a current I . 8. A steady current I exists in a long cylindrical wire of radius a . Find the magnetic field inside and outside the wire if (a) the current is uniformly distributed over the outside surface of the wire, and (b) the current is distributed in such a way that J is proportional to s , the distance from the axis. a d q v R I I P I a a s I...
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 Fall '10
 LOWELLWOOD
 Charge, Work

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