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JEE Main 2025 · PhysicsMultiple choiceSingle correctMediumApplication

JEE Main 2 April 2025, Shift 2, Physics Q43

Question 43 of 75 in this shift, Physics question 18 of 25, Section A.

A solenoid having area

A

and length

l

is filled with a material having relative permeability 2. The magnetic energy stored in the solenoid is :

(1) $\frac{B^2Al}{2\mu_0}$
(2) $\frac{B^2Al}{\mu_0}$
(3) $\frac{B^2Al}{4\mu_0}$ Official answer
(4) $B^2Al$

Official answer

Option 3

NTA final key.

Chapter: Electromagnetic Induction
Topic: Inductance
Idea tested: Magnetic Energy Density

Same idea in other shifts

Asked 2× in all

28 Jul 2022, Shift 1 · Q31The dimensions of $\left(\frac{B^2}{\mu_0}\right)$ will be : (if $\mu_0$ : permeability of free space and B : magnetic field)EasySingle correct

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.