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NEET UG PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT

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Application +4 | -1

A beam of electrons pass undeflected through a region in which uniform electric and magnetic fields are applied in mutually perpendicular directions and also perpendicular to the beam. If the strength of electric field is 10 kv/metre along Z-axis and the speed of the electron is

2 \times {10^3}\,\,m{s^{ - 1}}

towards positive X-axis. Then the magnetic field induction is

View answer and explanation

Correct option: B

5T along +Y axis.

Option A (5T along +Y axis) is incorrect. The correct answer is D (0.2 T along +Y axis). The magnetic field is calculated by equating the electric and magnetic forces and solving for B.

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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}

\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} }