JEE Main 2014PhysicsCurrent ElectricityMediumMCQ

JEE Main 2014 — Current Electricity Question with Solution

JEE Main 2014 (09 Apr Online)

Question

A d.c. main supply of e.m.f. 220 V is connected across a storage battery of e.m.f. 200 V through a resistance of 1  Ω . The battery terminals are connected to external resistance R. The minimum value of R, so that a current passes through the battery to charge it is:

Choose an option

Show full solutionCorrect option: C
Correct answer
C11 Ω

Step-by-step explanation

Given, 
emf of cell E = 200 V 
Resistance =  1Ω 
D. C. main supply voltage V = 220V
External resistance R = ?

r=E-VVR
1=20220×R
∴  R=11Ω
 

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About this question

This is a previous-year question from JEE Main 2014, 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.