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NEET UG PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT

1 Easy

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Understanding +4 | -1

Assertion: Electron moving perpendicular to

\mathop B\limits^I

will perform circular motion
Reason: Force by magnetic field is perpendicular to velocity

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Correct option: B

If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion

Option B (If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion) is correct. The assertion is true because the magnetic force is always perpendicular to the velocity, causing circular motion. The reason is also true, but it doesn't fully explain WHY the motion is circular (constant magnitude of velocity).

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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} }