JEE Main 2019PhysicsCurrent ElectricityMediumMCQ

JEE Main 2019 — Current Electricity Question with Solution

JEE Main 2019 (12 Apr Shift 1)

Question

To verify Ohm’s law, a student connects the voltmeter across the battery as shown in the figure. The measured voltage is plotted as a function of the current, and the following graph is obtained:

If Vo is almost zero, identify the correct statement:

Choose an option

Show full solutionCorrect option: A
Correct answer
AThe emf of the battery is 1.5 V and its internal resistance is 1.5 Ω

Step-by-step explanation

V=E-Ir
when V=V0=0⇒0=E-Ir
∴ E=Ir
when I=0, V=E=1.5 V
∴ r=1.5 Ω.

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About this question

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.