Question

The resistance of a resistor is reduced to half of its initial value. In doing
so, if other parameters of the circuit remain unchanged, the heating
effects in the resistor will become
(A)
two times.
(B)
half.
(C)
one-fourth.
(D)
four times.​

Answer 1

The heating  effects in the resistor will become half .

Given :

The resistance of a resistor is reduced to half of its initial value.

Now,

We know heat produced is given by :

$H=I^2Rt$

Here , I is current flowing through resistor .

R is resistance .

t is time taken .

From the above equation .

We can say that heat produced is directly proportional to resistance .

Therefore , If we half the resistance the heat produced will be also halved .

Hence , this is the required solution.

Learn More :

Resistance .

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