RE-NEET 2026 Physics Temperature Dependence of Resistance MCQ Question
Consider two circuits, (A) and (B), each having two resistors. One of them has a positive temperature coefficient of resistance, +α, while the other one has a negative temperature coefficient, -α, as shown in the figure. The current I_A and I_B. At initial temperature, the resistance of the two resistors is R₀. As the temperature is increased, the correct option that describes the variation of current in these circuits is:
I_A decreases while I_B increases
I_A increases while I_B decreases
both I_A and I_B remain constant
I_A remains constant while I_B increases
Correct Answer
Detailed Explanation
In circuit (A), the resistance increases with temperature, reducing the current I_A. In circuit (B), the resistance decreases with temperature, increasing the current I_B.
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