NEET UG PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT

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An electron of mass

{m_e}

initially at rest moves through a certain distance in a uniform electric field in time

{t_1}.

A proton of mass

{m_p}

also initially at rest takes time

{t_2}

to move through and equal distance in this uniform electric field. Neglecting the effect of gravity, the ratio of

{t_2}/{t_1}

is nearly equal to

View answer and explanation

Correct option: B

{\left( {{m_p}/{m_e}} \right)^{1/2}}

Option B is correct because the time taken to travel a certain distance under uniform acceleration is inversely proportional to the square root of the acceleration, which is proportional to the charge-to-mass ratio.

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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}

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