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NEET UG PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT

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Assertion (A): If an electron is not deflected while passing through a certain region of space, then only possibility is that there is no magnetic field in this region.

Reason (R): Force on an electron moving in a magnetic field is directly proportional to the magnetic field applied.

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Correct option: B

(A) and (R) are true and (R) is not correct explanation of (A)

Option D is correct because Assertion (A) is false, as an electron can pass undeflected if the electric and magnetic forces cancel each other, and Reason (R) is true, stating the force is proportional to the magnetic field.

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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} }