JEE Main 2026 — Current Electricity Question with Solution
JEE Main 2026 (21 January Shift 2)
Question
A battery with EMF and internal resistance is connected across a resistance . The power consumption in will be maximum when :
Choose an option
Show full solutionCorrect option: C
Correct answer
C
Step-by-step explanation
Power consumed in external resistance R is .
To find maximum, differentiate with respect to R:
.
gives .
This is the maximum power transfer theorem: maximum power is delivered when the external load resistance equals the source internal resistance.
To find maximum, differentiate with respect to R:
.
gives .
This is the maximum power transfer theorem: maximum power is delivered when the external load resistance equals the source internal resistance.
Practice this on the real CBT interface
Solve this JEE Main question (and the rest of the Current Electricity chapter) on PrepSharp's TCS iON-style CBT player — with timer, bookmarks and session analytics.
Solve interactively →About this question
This is a previous-year question from JEE Main 2026, covering the Current Electricity chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.