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# rev5sm10 - TA Tomoyuki Nakayama Thursday July 1 2010 PHY...

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TA: Tomoyuki Nakayama Thursday, July 1, 2010 PHY 2048: Physics 2 with Calculus, Summer C 2010 Review (Chapter 29.1- 30.12) The purpose of this review is to refresh your memory. Physics is a cumulative subject, so make it sure that you understand basic concepts and typical problem solving techniques in previous chapters before moving on to a new chapter. ________________________________________________________________________________ A. Magnetic Field due to Currents In the figure, current i = 50 mA is set up in a loop having two radial lengths and two semicircles of radii a = 4 cm and b = 8 cm with a common center P . Find the magnetic field at P and the loop’s magnetic dipole moment. B. Magnetic Force between Two Parallel Currents Three long wires are parallel to a z axis, and each carries a current of 2 A in the positive z direction There points of intersection with the xy plane form an equilateral triangle with sides of 30 cm as shown in the figure. A fourth wire (wire b ) passes through the midpoint of the base of the triangle and is parallel to the other three wires. If the net magnetic force on wire a is zero, what are the

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