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AIIMS 2014

Exam: AIIMS
Year: 2014
Subject: Physics
Chapter: Magnetic Effects of Current

AIIMS 2014 · Physics · Magnetic Effects of Current

A long straight wire carries 10 A d.c. current an electron travels...

A long straight wire carries 10 A d.c. current an electron travels perpendicular to the plane of this wire at a distance

0.1 \mathrm{~m}

with velocity

5.0 \times 10^6 \mathrm{~m} \mathrm{~s}^{-1}

. Force acting on the electron due to current in wire is

Options

Azero N
B $0.6 \times 10^{-17} \mathrm{~N}$
C $2.4 \times 10^{-17} \mathrm{~N}$
D $2.2 \times 10^{-17} \mathrm{~N}$

Correct answer

A. zero N

Step-by-step solution

Force on the electron

\vec{F}=-e(\vec{v} \times \vec{B})

. As electron is travelling in a plane perpendicular to the plane of wire, so angle

\theta

between

\vec{v}

and

\vec{B}

is either

0^{\circ}

or

180^{\circ}

and

\sin 0^{\circ}

or

\sin 180^{\circ}=0

.

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