JEE Main 2020PhysicsCurrent ElectricityEasyNumerical

JEE Main 2020 — Current Electricity Question with Solution

JEE Main 2020 (08 Jan Shift 2)

Question

The series combination of two batteries, both of the same emf 10V, but different internal resistance of 20 Ω and 5 Ω, is connected to the parallel combination of two resistors 30 Ω and x Ω. The voltage difference across the battery of internal resistance 20 Ω is zero, the value of x (in Ω) is____

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Show full solutionCorrect answer: 30
Correct answer
30

Step-by-step explanation

V1=ϵ1-i.r1
0=10-i×20
i=0.5A
V2=7.530+7.5x
0.5=0.25+7.5x
7.5x=0.25x=7.50.25=30 Ω

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About this question

This is a previous-year question from JEE Main 2020, 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.