JEE Main 2019 — Current Electricity Question with Solution
From: JEE Main 2019 (Online) 8th April Evening Slot
Question
A cell of internal resistance r drives current
through an external resistance R. The power
delivered by the cell to the external resistance
will be maximum when :-
Choose an option
Show full solutionCorrect option: B
Correct answer
BR = r
Step-by-step explanation
Current i =
Power generated in R
P = i2R
For maximum power
r = R or R = r
Power generated in R
P = i2R
For maximum power
r = R or R = r
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This is a previous-year question from JEE Main 2019, 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.