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Friday, 9 October

JEE Main 2026 · PhysicsMultiple choiceSingle correctMediumMulti-step

JEE Main 2 April 2026, Shift 1, Physics Q38

Question 38 of 75 in this shift, Physics question 13 of 25, Section A.

When a coil is placed in a time dependent magnetic field the power dissipated in it is PP. The number of turns, area of the coil and radius of the coil wire are NN, AA and rr respectively. For a second coils number of turns, area of the coil and radius of the coil wire are 2N2N, 2A2A and 3r3r respectively. When the first coil is replaced with second coil the power dissipated in it is 2 αP\sqrt2\,\alpha P. The value of α\alpha is _______.
  1. (1)3636Official answer
  2. (2)1282128\sqrt2
  3. (3)1616
  4. (4)6464

Official answer

Option 1

NTA final key.

Chapter
Electromagnetic Induction
Topic
Faraday's Law
Idea tested
N-Turns Multiplier for Coils

Same idea in other shifts

Asked 2× in all
  1. 31 Jan 2024, Shift 1 · Q43A coil is places perpendicular to a magnetic field of 5000 T. When the field is changed to 3000 T in 2 s, an induced emf of 22 V is…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.