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NEET UG PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT

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A tightly wound long solenoid carries a current of 1.5 A. An electron is executing uniform circular motion inside the solenoid with a time period of 75 ns. The number of turns per metre in the solenoid is ____.

[Take mass of electron

m_e=9 \times 10^{-31} \mathrm{~kg},

charge of electron

\left|{q}_{{e}}\right|=1.6 \times 10^{-19} \mathrm{C},

\mu_0=4 \pi \times 10^{-7} \frac{\mathrm{N}}{\mathrm{A}^2},

\left.1 \mathrm{~ns}=10^{-9} \mathrm{~s}\right]

View answer and explanation

Correct option: A

250

The correct answer is 250 because it is the calculated number of turns per meter in the solenoid based on the given parameters and the formula relating the magnetic field to the electron's circular motion.

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} }