COMEDK 2025 Morning Shift | Moving Charges and Magnetism Question 1 | Physics

A current loop consists of two identical semicircular parts each of radius $2 R$, one lying in the $x-y$ plane and the other in $x-z$ plane. If the current in the loop is I, the resultant magnetic field due to two semicircular parts at their common centre is

$\frac{\mu_o I}{4 R}$

$\frac{4 \mu_o I}{\sqrt{2} R}$

$\frac{\mu_o I}{\sqrt{2} R}$

$\frac{\mu_o I}{4 \sqrt{2} R}$

COMEDK 2025 Morning Shift

MCQ (Single Correct Answer)

-0

Two very long, straight, parallel wires carry steady currents I and 21 respectively. The distance between the wires is d . At a certain instant of time, a point charge $q$ is at a point equidistant from the two wires, in the plane of the wires. Its instantaneous velocity is v perpendicular to this plane. The magnitude of the force due to the magnetic field acting on the charge at this instant is

$\frac{\mu_o I q v}{\pi d}$

zero

$\frac{2 \mu_o I q v}{\pi d}$

$\frac{\mu_o I q v}{2 \pi d}$

COMEDK 2025 Morning Shift

MCQ (Single Correct Answer)

-0

A charged particle is released from rest in a region of space in which steady and uniform electric and magnetic fields are parallel to each other. The particle will move in a

Helix

Straight line

Cycloid

Circle

COMEDK 2024 Evening Shift

MCQ (Single Correct Answer)

-0

A current I flows in an infinitely long wire with cross section in the form of semi-circular ring of radius $$1 \mathrm{~m}$$. The magnitude of the magnetic induction along its axis is

$$\frac{\mu_0 \mathrm{I}}{2 \pi} \mathrm{T}$$

$$\frac{\mu_0 \mathrm{I}}{\pi^2} \mathrm{~T}$$

$$\frac{\mu_0 \mathrm{I}}{4 \pi^2} \mathrm{~T}$$

$$\frac{\mu_0 \mathrm{I}}{2 \pi^2} \mathrm{~T}$$

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