NEET UG PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT

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Which of the following statements is not true

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Correct option: A

While taking reading of tangent galvanometer, the plane of the coil must be set at right angles to the earth’s magnetic meridian

Option A (While taking reading of tangent galvanometer, the plane of the coil must be set at right angles to the earth’s magnetic meridian) is not true because the plane of the coil must be set *parallel* to the Earth's magnetic meridian.

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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 The resistance of an ideal voltmeter is