JEE Main 2014PhysicsMagnetic Properties of MatterMediumMCQ

JEE Main 2014 — Magnetic Properties of Matter Question with Solution

JEE Main 2014 (09 Apr Online)

Question

The mid points of two small magnetic dipoles of length d in end-on positions, are separated by a distance xx≫d. The magnitude of force between them is proportional to x−n where n is :

Choose an option

Show full solutionCorrect option: B
Correct answer
B 4

Step-by-step explanation

 

B = μ o 4 π 2 M x 3  for end-on position

U=− M → . B →

= μo 4π 2 M 2 x 3

F=− dU dx = −3μo 4π 2 M 2 x 4

therefore force between them ∝ x - 4

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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.