JEE Main 2020PhysicsCurrent ElectricityEasyMCQ

JEE Main 2020 — Current Electricity Question with Solution

JEE Main 2020 (02 Sep Shift 2)

Question

A potentiometer wire PQ of 1m length is connected to a standard cell E1. Another cell E2 of emf 1.02 V is connected with a resistance 'r' and switch S (as shown in figure). With switch S open, the null position is obtained at a distance of 49 cm fromQ. The potential gradient in the potentiometer wire is :

Choose an option

Show full solutionCorrect option: A
Correct answer
A0.02 V/cm

Step-by-step explanation

PQ=1 m

QJ=49 cm

∴ PJ=51 cm

vℓ=1.0251=0.02 v/cm

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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.