Q.
Three equal resistances, each of $R$ ohm, are connected as shown in figure. A battery of 2 V and internal resistance 0.1$\ \Omega\ $ is connected across the circuit. The value of $R$ for which the heat generated in the circuit will by maximum is
A) 0.3$\Omega$
B) 0.01$\Omega$
C) 0.1$\Omega$
D) 0.03$\Omega$
Explanation
(a) Total external resistance
${\ R}^{'} = R/3$
For maximum heat generation
$R_{ext} = r_{int}$
$\ \frac{R}{3} = 0.1$
$\ R = 0.3\ \Omega$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.