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AIIMS 201827 May
Exam
AIIMS
Year
2018
Date
27 May
Subject
Physics
Chapter
Magnetic Effects of Current

AIIMS 2018 · 27 May · Physics · Magnetic Effects of Current

Assertion : When radius of a circular loop carrying current is...

Assertion : When radius of a circular loop carrying current is doubled, its magnetic moment becomes four times. Reason : Magnetic moment depends on area of the loop.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion.
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion.
  3. CIf assertion is true but reason is false.
  4. DIf both assertion and reason are false.

Correct answer

A. If both assertion and reason are true and reason is the correct explanation of assertion.

Step-by-step solution

Magnetic dipole moment of the current loop = Ampere turns ×\times Area of the coil or M=NIπr2M=N I \pi r^2 When radius of the coil becomes double, new magnetic moment will be M1=NIπ(2r)2=4NIπr2=4MM_1=N I \pi(2 r)^2=4 N I \pi r^2=4 M Hence magnetic moment becomes four times when radius is doubled.
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