Question

Two heater coils made of the same material are connected in parallel across the mains . The lenght and diameter of the first of one coil are doubled that of the other. Which one of them will produce more heat

Answer 1

Answer:

Solution :

According to Joule heating , the rate at which heat is produced in a resistance is given by

. And in parallel ,

is same , i.e,

. So, <br>

<br>

<br> or

<br> That is heat produced in the thicker coil is more ( i.e, double) than that produced in the other coil.