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AIIMS 2004

Exam: AIIMS
Year: 2004
Subject: Physics
Chapter: Magnetic Effects of Current

AIIMS 2004 · Physics · Magnetic Effects of Current

The magnetic moment of a current (I) carrying circular coil of...

The magnetic moment of a current

(I)

carrying circular coil of radius

(r)

and number of turns (n) varies as

Options

A $1 / r^2$
B $1 / r$
C $r$
D $r^2$ .

Correct answer

D. $r^2$ .

Step-by-step solution

The magnetic moment of a current carrying conductor is

i \cdot n \pi r^2=n i A

. i.e. Magnetic moment

\propto r^2

.

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