Three wires of the same diameter are connected in turn between two points maintained at
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Three wires of the same diameter are connected in turn between two points maintained at
a constant potential difference. Their resistivities and lengths are r and L (wire A), 1.2r
and 1.2L (wire B), and 0.9r and L (wire C).
a. How does the rate at which energy is transferred to thermal energy vary with the
resistance of the wire? In other words, does the dU/dt increase with increasing
resistance or does it decrease with increasing resistance? Remember, the potential
across each wire is the same. Explain.
b. Using your answer from part (a), rank the wires according to the rate at which
energy is transferred to thermal energy within them, greatest to least.
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