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# HW-09s - HOMEWORK for TUESDAY For each of the following...

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HOMEWORK for TUESDAY, JULY 12, 2005 For each of the following situations two circuit loops are shown in a uniform external magnetic field . Let the one on the left have a clockwise current F t ext and the one on the right have a counterclockwise current. For each loop show the direction of . Determine in each case the forces acting on each side of F t loop the current and determine if there is a net force or a net torque. If there is a net torque, determine how the loop will rotate, and describe how this is related to the directions of and . F F t t loop ext 1. Œ F t ext Clockwise current on left: is down ; forces on top, right, bottom, F Ð Œ Ñ t loop left sides are, respectively, , , , and (all directed outward). There is no Å Ä Æ Ã net force and no net torque. Counterclockwise current on right: is up ; forces on top, right, F Ð  Ñ t loop bottom, and left sides are, respectively, and (all directed inward). Æ ß Ã ß Å ß Ä There is no net force and no net torque. 2.  F t ext Clockwise current on left: is down ; forces on top, right, bottom, F Ð Œ Ñ t loop left sides are, respectively, and (all directed inward). There is no Æ ß Ã ß Å ß Ä net force and no net torque.

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