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NEET UG PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT

1 Hard

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Application +4 | -1

A long straight wire carries a current of

20 \mathrm{~A}

. The maximum force experienced by an electron moving at a speed of

100 \mathrm{~km} / \mathrm{s}

, at a distance of

6.4 \mathrm{~cm}

from the wire is

View answer and explanation

Correct option: A

10^{-18} \mathrm{~N}

Option B (

10^{-19} \mathrm{~N}

) is correct because it is the maximum force calculated using the magnetic field due to the wire and the Lorentz force on the electron.

More Questions from MAGNETIC EFFECT OF CURRENT

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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} }