A 10-V battery is connected to a 15-? resistor and an unknown resistor R, as shown. The current in the circuit is 0.40 A. How much heat is produced in the 15-? resistor in 2.0 min?
A. 0.40 kJ
B. 0.19 kJ
C. 0.29 kJ
D. 0.72 kJ
E. 0.80 kJ
Answer: C
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