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NEET UG PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT

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A solenoid of length 0.4 m and having 500 turns of wire carries a current of 3 A. A thin coil having 10 turns of wire and of radius 0.01 m carries of 0.4 A. Assuming long solenoid, magnetic field at the centre of the solenoid is

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Correct option: A

1.5\pi \times {10^{ - 7}}\,T

Option A (

1.5\pi \times {10^{ - 7}}\,T

) is incorrect. The correct answer should be

1.57 \times 10^{-3} T

. The provided answer seems to have an error in the exponent. The question is asking for the magnetic field at the center of the solenoid, not the field due to the thin coil.

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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} }