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NEET UG PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT

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Analyzing +4 | -1

Assertion: If the current in a solenoid is
reversed in direction while keeping the same
magnitude, the magnetic field energy stored in the
solenoid decreases.
Reason: Magnetic field energy density is
proportional to square of current

View answer and explanation

Correct option: D

If both the Assertion and Reason are
incorrect.

Option D (If both the Assertion and Reason are incorrect) is correct because reversing the current direction doesn't decrease the magnetic field energy, and the energy density is proportional to the square of the magnetic field, not the current.

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}

\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} }