COMEDK 2025 Afternoon Shift | Moving Charges and Magnetism Question 5 | Physics

In to a uniform transverse magnetic field, two charged particles having the same mass and charge enter and move in two different circular paths. The ratio of the radii of curvatures of the circular paths is $1: 4$. What would be the ratio of their respective velocities?

$\frac{r_1}{r_2}=4: 1$

$\frac{r_1}{r_2}=2: 1$

$\frac{r_1}{r_2}=1: 2$

$\frac{r_1}{r_2}=1: 4$

COMEDK 2025 Afternoon Shift

MCQ (Single Correct Answer)

-0

A rectangular coil of length 10 cm and breadth 9 cm carries a current of 10 A . A long straight conductor carrying a current of 20 A is placed 1 cm from the coil parallel to its length and in the same plane of the coil. What will be the net force acting on the straight conductor?

$1.8 \times 10^{-4} \mathrm{~N}$

$3.6 \times 10^{-4} \mathrm{~N}$

$1.8 \times 10^{-5} \mathrm{~N}$

$3.6 \times 10^{-5} \mathrm{~N}$

COMEDK 2025 Afternoon Shift

MCQ (Single Correct Answer)

-0

What is the kinetic energy of the electron in the nth level, moving in a plane under the influence of a magnetic field ' B '? [ m -mass of electron; h - Planck's constant; e- electronic charge]

$\frac{h e B}{4 \pi n m}$

$\frac{n h e B}{4 \pi m}$

$\frac{n h e B}{2 \pi m}$

$\frac{h e B}{2 \pi n m}$

COMEDK 2025 Morning Shift

MCQ (Single Correct Answer)

-0

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

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

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

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

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

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