NEET UG PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT

1 Hard

1 of 1

Application +4 | -1

A long current carrying wire produces a magnetic field of

1 \mathrm{~T}

at a distance of

\mathrm{r}

. The magnetic field at (A)

\frac{r}{2}

, (B)

2 r

and (C)

3 r

View answer and explanation

Correct option: A

(A)

=2 \mathrm{~T},(\mathrm{~B})=\frac{1}{2} \mathrm{~T},(\mathrm{C})=\frac{1}{3} \mathrm{~T}

Option A is correct because the magnetic field is inversely proportional to the distance from the wire, so halving the distance doubles the field, and doubling/tripling the distance halves/thirds the field.

More Questions from MAGNETIC EFFECT OF CURRENT

Practice All Chapter MCQs →

Which of the following statements is not true A current loop in a magnetic field Given below are two statements:
Statement (I): When currents vary with time, Newton’s third law is valid only if momentum carried by the electromagnetic field is taken into account.
Statement (II): Ampere's circuital law does not depend on Biot-Savart’s law.
In the light of the above statements, choose the correct answer from the options given below: The magnetic field due to current carrying a circular loop of radius

5 \mathrm{~cm}

at a point on the axis at a distance of

12 \mathrm{~cm}

from the center is

250 \mu \mathrm{T}

. The magnetic field at the center of the loop is The magnetic field

d \vec{B}

due to a small current element

d \vec{l}

at distance

\vec{r}

and element carrying current

i

is Three long straight conductors carry currents 4A, 2A and 3A into the plane of paper. A circular path is imagined to be enclosing these currents. The value of

\oint {\overrightarrow B .\overrightarrow {dl} }

b is