JEE Main 2026 · PhysicsMultiple choiceSingle correctMediumMulti-step

JEE Main 4 April 2026, Shift 1, Physics Q40

Question 40 of 75 in this shift, Physics question 15 of 25, Section A.

A parallel plate air capacitor is connected to a battery. The plates are pulled apart at uniform speed

v

. If

x

is the separation between the plates at any instant, then the time rate of change of electrostatic energy of the capacitor is proportional to

x^{\alpha}

, where

\alpha

is ______.

(1) $-2$ Official answer
(2) $1$
(3) $-1$
(4) $2$

Official answer

Option 1

NTA final key.

Chapter: Electrostatic Potential and Capacitance
Topic: Parallel Plate Capacitors
Idea tested: Energy Stored in Capacitor

Same topic in other shifts

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Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.