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Saturday, 31 October

JEE Main 2023 · PhysicsNumerical answerNumerical valueHardMulti-step

JEE Main 12 April 2023, Shift 1, Physics Q51

Question 51 of 90 in this shift, Physics question 21 of 30, Section B.

A compass needle oscillates 20 times per minute at a place where the dip is 30∘30^\circ and 30 times per minute where the dip is 60∘60^\circ. The ratio of total magnetic field due to the earth at two places respectively is 4x\frac{4}{\sqrt{x}}. The value of xx is

Official answer

243

NTA final key.

Chapter
Magnetism and Matter
Topic
Earth's Magnetism
Idea tested
Magnetic Inclination (Dip)

Same idea in other shifts

Asked 2× in all
  1. 29 Jul 2022, Shift 2 · Q48The vertical component of the earth's magnetic field is 6×10−56\times10^{-5} T at any place where the angle of dip is 37∘37^\circ. The earth's…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 108 of the 174 JEE Main shifts held from 2017 to 2026.