A 20-cm-long, zero-resistance slide wire moves outward, onzero-resistance rails,

Question

A 20-cm-long, zero-resistance slide wire moves outward, onzero-resistance rails, at a steady speed of 10 m/s in a 0.11 Tmagnetic field. On the opposite side, a 0.8 carbon resistorcompletes the circuit by connecting the two rails. The mass of theresistor is 50 mg. (a) What is the induced current in the circuit?
1 A (b) How much force is needed to pull the wire at thisspeed?
2 N (c) If the wire is pulled for 10 s, what is the temperatureincrease of the carbon? The specific heat of carbon is 710 J/kg· C°.
Answer = ________________ C°

Explanation / Answer

F = IBL = 0.00605 N

(c) I2R*t = mc*T
T = 0.017 C°

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