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Two 1.50-V batteries—with their positive terminals in the same direction—are inserted in series into the barrel of a flashlight. One battery has an internal resistance of 0.250 ?, the other an internal resistance of 0.120 ?. When the switch is closed, a current of 600 mA occurs in the lamp.

(a) What is the bulb's resistance?
(b) What fraction of the chemical energy transformed appears as internal energy in the batteries?

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