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

The capacitance of a parallel plate capacitor is $$400 \mathrm{~pF}$$. It is connected to an ac source of $$100 \mathrm{~V}$$ having an angular frequency $$100 \mathrm{~rad~s}^{-1}$$. If the rms value of the current is $$4 \mu \mathrm{A}$$, the displacement current is:

A
$$4 \times 10^{-2} \mu \mathrm{A}$$
B
0.4 $$\mu$$A
C
4 $$\mu$$A
D
4 A
2
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Though $$\mathrm{Sn}$$ and $$\mathrm{Si}$$ are $$4^{\text {th }}$$ group elements, $$\mathrm{Sn}$$ is a metal while $$\mathrm{Si}$$ is a semiconductor because

A
$$\mathrm{Sn}$$ has more electrons than $$\mathrm{Si}$$
B
The energy gap of $$\mathrm{Sn}$$ is zero volt while that of $$\mathrm{Si}$$ is $$0.07 \mathrm{~V}$$
C
The energy gap of $$\mathrm{Sn}$$ is $$1.1 \mathrm{~eV}$$ volt while that of $$\mathrm{Si}$$ is $$0.07 \mathrm{~V}$$
D
$$\mathrm{Sn}$$ has more holes than $$\mathrm{Si}$$
3
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Five charges, '$$q$$' each are placed at the comers of a regular pentagon of side '$$a$$' as shown in figure. First, charge from '$$A$$' is removed with other charges intact, then charge at '$$A$$' is replaced with an equal opposite charge. The ratio of magnitudes of electric fields at $$\mathrm{O}$$, without charge at $$A$$ and that with equal and opposite charge at $$A$$ is

COMEDK 2024 Morning Shift Physics - Electrostatics Question 5 English

A
4 : 1
B
2 : 1
C
1 : 4
D
1 : 2
4
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Two circular coils of radius '$$a$$' and '$$2 a$$' are placed coaxially at a distance ' $$x$$ and '$$2 x$$' respectively from the origin along the $$\mathrm{X}$$-axis. If their planes are parallel to each other and perpendicular to the $$\mathrm{X}$$ - axis and both carry the same current in the same direction, then the ratio of the magnetic field induction at the origin due to the smaller coil to that of the bigger one is:

A
2 : 1
B
1 : 1
C
1 : 4
D
1 : 2
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