The heat developed in an electric wire of resistance $R$ by a current $I$ for a time $t$ is
- A$\frac{I^2 Rt}{4.2} \text{ cal}$
- B$\frac{I^2 t}{4.2 R} \text{ cal}$
- C$\frac{I^2 R}{4.2 t} \text{ cal}$
- D$\frac{Rt}{4.2 I^2} \text{ cal}$
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