Physics 21 Fall 2007 Solution to HW-11 27.35 A long wire with a current I amps makes two 90 degree bends, as shown in the figure. The bent part of the wire passes through a uniform magnetic field B directed out of the page and confined to a limited region of space. Find the force on the wire. 60. cm 60. cm 4.5 A 30. cm B axis I 0.35 m 27.44 A rectangular current loop 0.22 m by 0.35 m with I amps is oriented with the loop plane perpendicular to a magnetic field B . Calculate (A) the net force and (B) the torque that B exerts on the coil. The coil is rotated 30 o about the axis shown, with the left side coming out of the page. Calculate (C) the net force and (D) the net torque that B exerts on the coil. 0.22 m 27.62 A long, straight wire containing a semicircular region of radius 0.95 m is placed in a uniform magnetic field of magnitude 2.20 T as shown in the figure. What is the net magnetic force acting on the wire when it carries a current of 3.40 A? In class we found that the force on the semicircular loop was 2
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