The figure shows a zero-resistance rod sliding to the right on two zero-resistan

Question

The figure shows a zero-resistance rod sliding to the right on two zero-resistance rails separated by the distance = 0.385 m. The rails are connected by a 12.0 ohm resistor, and the entire system is in a uniform magnetic field with a magnitude of 0.783 T.

A.)Find the force that must be exerted on the rod to maintain a constant current of 0.149 in the resistor. Got 44.9 mN and was right.
B.) What is the rate of energy dissipation in the resistor? Got .266 W and was right.
C.) What is the mechanical power delivered to the rod? Got .249 W and was wrong.

Explanation / Answer

c )  Mechanical power deliverd to rod  is  P  = I^2 R

 

                                                                  = ( 0.149 A )* 12 ohms

 

                                                                  = 0.2664 W

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