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The figure(Figure 1) shows a zero-resistance rod sliding to the right on two zero-resistance rails separated by the distance L = 0.519m . The rails are connected by a 12.1? resistor, and the entire system is in a uniform magnetic field with a magnitude of 0.690T Figure 1 Part A Find the force that must be exerted on the rod to maintain a constant current of 0.138A in the resistor. Part B What is the rate of energy dissipation in the resistor? Part C What is the mechanical power delivered to the rod?
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Added Mon, 03 Aug '15
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a ]

F = B*i*L,

F = 0.69*0.138*0.519= 0.0494 N

b)

P = i^2 R = 0.138^2 * 12.1 = 0.2304 W

c) P = F*v

I*R = B*l*v,

v = 0.138*12.1/(0.69*0.519) =4.6628 m/s

so ,

mech P = 0.0494*4.6628 =0.2303 W
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