NEET UG PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT

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Understanding +4 | -1

A straight wire of diameter

0.5 \mathrm{~mm}

carrying a current of

1 \mathrm{~A}

is replaced by another wire of

1 \mathrm{~mm}

diameter carrying the same current. The strength of the magnetic field far away is

View answer and explanation

Correct option: B

Same as the earlier value

Option B (Same as the earlier value) is correct because the magnetic field strength depends on the current and distance, not the diameter of the wire.

More Questions from MAGNETIC EFFECT OF CURRENT

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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