COMEDK 2025 Morning Shift | Alternating Current Question 1 | Physics

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

15K

13K

zero

COMEDK 2025 Morning Shift

MCQ (Single Correct Answer)

-0

If $R$ and $L$ denote resistance and inductance of a material, then the dimension of $L R$ will be:

$M^2 L^4 T^{-5} A^{-4}$

$M L T A^{-1}$

$M^0 L^0 T^0 A^0$

$M^{-1} L^4 T A^{-3}$

COMEDK 2025 Morning Shift

MCQ (Single Correct Answer)

-0

A bulb of resistance 280 Ohm is supplied with a voltage $\mathrm{V}=400 \sin \pi \mathrm{t}$. The peak current is

2.22 A

2.02 A

1.11 A

1.43 A

COMEDK 2025 Morning Shift

MCQ (Single Correct Answer)

-0

An LCR series ac circuit is at resonance with 10 V each across $\mathrm{L}, \mathrm{C}$ and R . If the resistance is halved, the respective voltage across $R, C$ and $L$ are

$5 \mathrm{~V}, 10 \mathrm{~V}, 10 \mathrm{~V}$

$10 \mathrm{~V}, 5 \mathrm{~V}, 5 \mathrm{~V}$

$5 \mathrm{~V}, 5 \mathrm{~V}, 5 \mathrm{~V}$

$10 \mathrm{~V}, 20 \mathrm{~V}, 20 \mathrm{~V}$

COMEDK Subjects