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Physics · Electromagnetic Waves

JEE Main 2026 — 24 January, Evening Shift — Question 41

A point source is kept at the center of a spherically enclosed detector. If the volume of the detector increased by 8 times, the intensity will

  1. Option A:

    increase by 8 times

  2. Option B:

    increase by 64 times

  3. Option C:

    decrease by 8 times

  4. Option D:

    decrease by 4 times

    Correct

Answer: D

Step-by-step solution

V→8 V⇒R→2R\mathrm{V} \rightarrow 8 \mathrm{~V} \Rightarrow \mathrm{R} \rightarrow 2 \mathrm{R} ⇒A→4 A\Rightarrow \mathrm{A} \rightarrow 4 \mathrm{~A} ⇒I→I04\Rightarrow \mathrm{I} \rightarrow \frac{\mathrm{I}_{0}}{4}

Answer key and solution verified before publishing.

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Exam
JEE Main 2026
Paper
24 January, Evening Shift
Subject
Physics
Chapter
Electromagnetic Waves
Topic
Power , Energy and Intensity of EM Waves
A point source is kept at the center of a spherically enclosed… | JEE Main 2026 PYQ with Solution · DhiX AI