1
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

An AC voltage source of variable angular frequency $$\omega$$ and fixed amplitude $$\mathrm{V}_0$$ is connected in series with a capacitance $$\mathrm{C}$$ and an electric bulb of resistance $$\mathrm{R}$$ (inductance zero). When $$\omega$$ is decreased

A
the bulb switches off
B
total impedance of the circuit is unchanged
C
the bulb glows brighter
D
the bulb glows dimmer
2
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

3 point charges each of $$-\mathrm{q}$$ are placed on the circumference of a circle of diameter $$2 \mathrm{a}$$ at $$\mathrm{A}, \mathrm{B}$$ and $$\mathrm{C}$$ respectively as shown in figure. The electric field at $$\mathrm{O}$$ is

COMEDK 2024 Afternoon Shift Physics - Electrostatics Question 5 English

A
Zero
B
$$\frac{\mathrm{Kq}}{2 \mathrm{a}}$$ towards $$\mathrm{OC}$$
C
$$\frac{\mathrm{Kq}}{\mathrm{a}}$$ towards $$\mathrm{OB}$$
D
$$\frac{\mathrm{Kq}}{\mathrm{a}}$$ towards $$\mathrm{OA}$$
3
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

To increase the current sensitivity of a moving coil galvanometer by $$25 \%$$, its resistance is increased so that the new resistance becomes twice its initial resistance. By what factor does the voltage sensitivity change?

A
Decreases by $$62.5 \%$$
B
Decreases by $$37.5 \%$$
C
Increases by $$37.5 \%$$
D
Increases by $$62.5 \%$$
4
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

A uniformly charged solid sphere of radius $$\mathrm{R}$$ has potential $$\mathrm{V}_0$$ (measured with respect to infinity) on its surface. For this sphere the equipotential surfaces with potentials $$\frac{3 \mathrm{~V}_0}{2}, \frac{\mathrm{V}_0}{1}, \frac{3 \mathrm{~V}_0}{4}$$ and $$\frac{\mathrm{V}_0}{4}$$ have radius $$\mathrm{R}_1, \mathrm{R}_2, \mathrm{R}_3$$ and $$\mathrm{R}_4$$ and respectively, then

A
$$ R_1 \neq 0 \text { and }\left(R_2-R_1\right)>\left(R_4-R_3\right) $$
B
$$ R _2< R_4 $$
C
$$ R_1=0 \text { and } R_2>\left(R_4-R_3\right) $$
D
$$ R_1=0 \text { and } R_2<\left(R_4-R_3\right) $$
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