1
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-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
A
$\frac{\mu_o I}{4 R}$
B
$\frac{4 \mu_o I}{\sqrt{2} R}$
C
$\frac{\mu_o I}{\sqrt{2} R}$
D
$\frac{\mu_o I}{4 \sqrt{2} R}$
2
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
Which of the following is not a characteristic of diamagnetism?
A
The material moves from a region of strong magnetic field to weak magnetic field.
B
The origin of diamagnetism is the spin of electrons.
C
Their magnetic susceptibility is small and negative.
D
Diamagnetic materials are repelled by bar magnets.
3
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
An ideal inductor is connected across a capacitor. Oscillations of energy $K$ are set up in the circuit. The capacitor plates are slowly drawn apart such that the frequency of oscillations is quadrupled. The work done in the process is
A
15K
B
13K
C
zero
D
2K
4
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
A symmetric double convex lens is cut into two equal parts by a plane perpendicular to the principal axis. If the power of the original lens is 4D, the difference between the powers of the original lens and the cut lens is
A
zero
B
3D
C
D
D
2D
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