160CHAPTER 19 (d) The cable creates zerofield at exterior points, since a loop in Ampère’s law encloses zero total current. 19.44(a) ()()()()270124410TmA10.0 A220.100 m2.0010N m attractionI IFLdπµππ−−×⋅===×(b) The magnitude remains the same as calculated in (a), but the wires are repelled. Thus, ()42.0010N m repulsionFL−=×19.45In order for the system to be in equilibrium, the repulsive magnetic force per unit length on the top wire must equal the weight per unit length of this wire. Thus,0120.080 N m2I IFLdµπ==, and the distance between the wires will be ()()()()()70123410TmA60.0 A30.0 A20.080 N m20.080 N m4.510m4.5 mmI Idπµππ−−×⋅===×=19.46The magnetic forces exerted on the top and bottom segments of the rectangular loop are
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