MHT CET 2025 19th April Evening Shift | Moving Charges and Magnetism Question 7 | Physics

Two long conductors separated by a distance ' d ' carry currents ' $\mathrm{I}_1$ ' and ' $\mathrm{I}_2$ ' in the same directions. They exert a force ' $F$ ' on each other. The distance between them is increased to ' 3 d '. If new repulsive force of magnitude ' $\frac{2}{3} \mathrm{~F}$ ' is found between these conductors, the required change in the magnitude and direction of one of the currents in the conductor is respectively [length of the conductors is constant]

same, reversed.

twice, reversed.

thrice, same.

twice, same.

MHT CET 2025 19th April Morning Shift

MCQ (Single Correct Answer)

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Two long parallel wires carrying currents 4 A and 3 A in opposite directions are placed at a distance of 5 cm from each other. A point P is at equidistance from both the wires such that the line joining the point P to the wires are perpendicular to each other. The magnitude of magnetic field at point $P$ is ( $\mu_0=$ permeability of free space $=4 \pi \times 10^{-7}$ SI unit)

$4 \times 10^{-5} \mathrm{~T}$

$\sqrt{2} \times 10^{-5} \mathrm{~T}$

$2 \times 10^{-5} \mathrm{~T}$

$2 \sqrt{2} \times 10^{-5} \mathrm{~T}$

MHT CET 2025 19th April Morning Shift

MCQ (Single Correct Answer)

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The ratio of angular momentum $L$ of an electron to the magnetic dipole moment $\overrightarrow{\mathrm{m}}_{\text {orb }}$ is ( ' $m$ ' is mass of electron, ' $e$ ' is charge on electron)

$\frac{\mathrm{e}}{\mathrm{m}}$

$\frac{2 m}{e}$

$\frac{\mathrm{e}}{2 \mathrm{~m}}$

$\frac{\mathrm{m}}{\mathrm{e}}$

MHT CET 2025 19th April Morning Shift

MCQ (Single Correct Answer)

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Two long straight wires A and B carrying equal current 'I' were kept parallel to each other at distance ' $d$ ' apart. Magnitude of magnetic force experienced by length $L$ of wire $A$ is ' $F$ '. If the distance between the wires is made half and currents are doubled, force $F_2$ on length $L$ of wire $A$ will be

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