A) \[4.35\text{ }cal\]
B) \[5.73\text{ }cal\]
C) \[7.5\text{ }cal\]
D) \[2.5\text{ }cal\]
Correct Answer: C
Solution :
From Joule's law, for a current carrying conductor at a definite temperature the rate of production of heat is given by \[H=Vit\] where i is current, V the potential difference and t the time. Given, \[V=15\text{ }volt,\] \[i=2.1A,\] \[t=1s\] \[\therefore \] \[H=15\times 2.1\times 1=31.5J\] Also, \[1cal=4.2J\] \[\therefore \] \[H=\frac{31.5}{4.2}=7.5\,cal\]You need to login to perform this action.
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