JEE Main 2014PhysicsMagnetic Properties of MatterMediumMCQ

JEE Main 2014 — Magnetic Properties of Matter Question with Solution

JEE Main 2014 (09 Apr Online)

Question

The magnetic field of earth at the equator is approximately 4 × 1 0 - 5 T . The radius of earth is 6.4 × 1 0 6 m . Then the dipole moment of the earth will be nearly of the order of :

Choose an option

Show full solutionCorrect option: D
Correct answer
D1023 A m2

Step-by-step explanation



B = μ 0 4 π · M d 3 = 1 0 - 7 × M 6.4 × 1 0 6 3

∴    4 × 1 0 - 5 = 1 0 - 7 × M 6.4 × 1 0 6 3

∴    M = 6.4 × 1 0 6 3 × 4 × 1 0 - 5 1 0 - 7

          = 6.4 3 × 1 0 1 8 × 4 × 1 0 2

          = 6.4 3 × 4 × 1 0 2 0

          = 1 . 0 4 8 × 1 0 2 3 ≈ 10 23  A m 2

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About this question

This is a previous-year question from JEE Main 2014, covering the Magnetic Properties of Matter chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.