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