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AIIMS 2011

Exam: AIIMS
Year: 2011
Subject: Physics
Chapter: Magnetic Effects of Current

AIIMS 2011 · Physics · Magnetic Effects of Current

Magnetic field at a distance a from long current carrying wire is...

Magnetic field at

a

distance a from long current carrying wire is proportional to

Options

A $\frac{1}{a}$
B $\frac{1}{a^2}$
C $\frac{1}{\sqrt{a}}$
D $\frac{1}{a^{3 / 2}}$

Correct answer

A. $\frac{1}{a}$

Step-by-step solution

The expression for magnetic field is case of a long current carrying wire is

B=\frac{\mu_0 I}{2 \pi a}

i.e,

B \propto \frac{1}{a}

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