COMEDK 2026 Afternoon Shift | Moving Charges and Magnetism Question 1 | Physics

A circular coil of radius $r=10 c m$ having 300 turns carries a current of 2 A . The coil is suspended vertically in a uniform magnetic field of strength 0.7 T . If the plane of the coil makes an angle $30^{\circ}$ with the magnetic field, the torque needed to prevent it from turning is:

11.42 Nm

1.1 Nm

22.84 Nm

5.71 Nm

COMEDK 2026 Afternoon Shift

MCQ (Single Correct Answer)

-0

An electric field and magnetic field $1.8 \times 10^4 \mathrm{Vm}^{-1}$ and $6 \times 10^{-3} \mathrm{~T}$ respectively are applied simultaneously on an electron beam such that path of the beam remains undeviated, then the speed of the electron will be:

$1.5 \times 10^6 \mathrm{~ms}^{-1}$

$3 \times 10^7 \mathrm{~ms}^{-1}$

$3 \times 10^6 \mathrm{~ms}^{-1}$

$1.5 \times 10^7 \mathrm{~ms}^{-1}$

COMEDK 2026 Afternoon Shift

MCQ (Single Correct Answer)

-0

The current through the circular coil is halved and the radius of the coil is doubled. If $B_1$ and $B_2$ are respectively the initial and final magnetic field strength, then:

$B_2=4 B_1$

$B_2=2 B_1$

$B_2=\frac{B_1}{4}$

$B_2=\frac{B_1}{2}$

COMEDK 2026 Afternoon Shift

MCQ (Single Correct Answer)

-0

A galvanometer of resistance $50 \Omega$ is having 30 divisions and a current sensitivity $10 \mathrm{~mA} /$ div. What should be the shunt resistance so that it can be converted into an ammeter of range 10 A ?

$0.76 \Omega$

$2.5 \Omega$

$1.55 \Omega$

$3.1 \Omega$

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