A long horizontal wire carries a current of 48 A. A second wire, made of 1.00-mm-diameter copper wire and parallel to the first, is kept in suspension magnetically 5.0 cm below (Fig. 28–57). ( a ) Determine the magnitude and direction of the current in the lower wire. ( b ) Is the lower wire in stable equilibrium? ( c ) Repeat parts ( a ) and ( b ) if the second wire is suspended 5.0 cm above the first due to the first’s magnetic field. FIGURE 28–57 Problem 58.
A long horizontal wire carries a current of 48 A. A second wire, made of 1.00-mm-diameter copper wire and parallel to the first, is kept in suspension magnetically 5.0 cm below (Fig. 28–57). ( a ) Determine the magnitude and direction of the current in the lower wire. ( b ) Is the lower wire in stable equilibrium? ( c ) Repeat parts ( a ) and ( b ) if the second wire is suspended 5.0 cm above the first due to the first’s magnetic field. FIGURE 28–57 Problem 58.
A long horizontal wire carries a current of 48 A. A second wire, made of 1.00-mm-diameter copper wire and parallel to the first, is kept in suspension magnetically 5.0 cm below (Fig. 28–57). (a) Determine the magnitude and direction of the current in the lower wire. (b) Is the lower wire in stable equilibrium? (c) Repeat parts (a) and (b) if the second wire is suspended 5.0 cm above the first due to the first’s magnetic field.
(I) How much current is flowing in a wire 4.80 m long if themaximum force on it is 0.625 N when placed in a uniform0.0800-T field?
(II) A rectangular loop of wire is placed next to a straight
wire, as shown in Fig. 20-55. There is a current of 3.5 A in
both wires. Deter-
3.5 A
mine the magnitude
and direction of the
net force on the loop.
3.5 A
3.0 cm
5.0 cm
FIGURE 20-55
Problem 31.
10.0 cm-
Suspending Suspending a wire with a current. A horizontal wire carries a current I1 = 80 A dc. A second parallel wire 20 cm below it (Fig. 28-7) must carry how much current I2 so that it doesn't fall due to gravity? The lower wire has a mass of 0.12 g per meter of length.
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