A wire of mass 100 ~g , length 1 ~m and current 5 ~A is balanced in mid air by a magnetic field B , then find the value of B .

Correct answer: A. 0.2 ~T Here, m=100 ~g=10^ -1 ~kg, l=1 ~m, I=5 ~A For a wire balanced midway air by a magnetic field is m g=I l B or B=(m g)/(I l) = 10^ -1 × 10 5 × 1 B=0.2 ~T

AIIMS 2012

Exam: AIIMS
Year: 2012
Subject: Physics
Chapter: Magnetic Effects of Current

AIIMS 2012 · Physics · Magnetic Effects of Current

A wire of mass 100 ~g , length 1 ~m and current 5 ~A is balanced in...

A wire of mass

100 \mathrm{~g}

, length

1 \mathrm{~m}

and current

5 \mathrm{~A}

is balanced in mid air by a magnetic field

B

, then find the value of

B

Options

A $0.2 \mathrm{~T}$
B $0.1 \mathrm{~T}$
C $0.5 \mathrm{~T}$
D $0.6 \mathrm{~T}$

Correct answer

A. $0.2 \mathrm{~T}$

Step-by-step solution

Here,

m=100 \mathrm{~g}=10^{-1} \mathrm{~kg}, l=1 \mathrm{~m}, I=5 \mathrm{~A}

For a wire balanced midway air by a magnetic field is

m g=I l B

B=\frac{m g}{I l}

=\frac{10^{-1} \times 10}{5 \times 1}

B=0.2 \mathrm{~T}

Practice Magnetic Effects of Current on Quantrex Academy →

More from Magnetic Effects of Current