A parallel plate capacitor consists of two circular plates each of radius 12 cm and separated by 5.0 mm. The capacitor is being charged by an external source. The charging current is constant and is equal to 0.15 A. The rate of change of the potential difference between the plates will be:

1. \(1.873 \times 10^7 \mathrm{~V} / \mathrm{s}\)
2. \(1.873 \times 10^8 \mathrm{~V} / \mathrm{s}\)
3. \(1.873 \times 10^9 \mathrm{~V} / \mathrm{s}\)
4. \(1.873 \times 10^{10} \mathrm{~V} / \mathrm{s}\)

Subtopic:  Displacement Current |
 60%
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A lamp emits monochromatic green light uniformly in all directions. The lamp is 3% efficient in converting electrical power to electromagnetic waves and consumes 100 W of power. The amplitude of the electric field associated with the electromagnetic radiation at a distance of 5 m from the lamp will be:
1. 1.34 V/m
2. 2.68 V/m
3. 4.02 V/m
4. 5.36 V/m

Subtopic:  Properties of EM Waves |
 60%
From NCERT
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A parallel plate capacitor consists of two circular plates each of radius 2 cm, separated by a distance of 0.1 mm. If the voltage across the plates is varying at the rate of 5×1013 V/s, then the value of displacement current is :

(1) 5.50 A

(2) 5.56×102 A

(3) 5.56×103 A

(4) 2.28×104 A

Subtopic:  Maxwell's Equations |
 64%
From NCERT
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In an electromagnetic wave, the direction of the magnetic field induction B is

(1) parallel to electric field E

(2) perpendicular to electric field E

(3) antiparallel to Poynting vector S

(4) random

Subtopic:  Properties of EM Waves |
 93%
From NCERT
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In an electromagnetic wave

(1) Power is transmitted along the magnetic field

(2) Power is transmitted along the electric field

(3) Power is equally transferred along with the electric and magnetic fields

(4) power is transmitted in a direction perpendicular to both the fields

Subtopic:  Properties of EM Waves |
From NCERT
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For any E.M. wave if E = 100 V/m and the magnetising field is equal to 0.265 A/m. Then the rate of maximum energy flow per unit area is:

(1) 3.33×10-5 J/m2

(2) 26.5 W/m2

(3) 3×108 J/m2

(4) None of these

Subtopic:  Properties of EM Waves |
 73%
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A variable frequency AC source is connected to a capacitor. Then on increasing the frequency:

1. Both conduction current and displacement current will increase
2. Both conduction current and displacement current will decrease
3. Conduction current will increase and displacement current will decrease
4. Conduction current will decrease and displacement current will increase
Subtopic:  Displacement Current |
 73%
From NCERT
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Source of an electromagnetic wave is

(1) A charge moving with constant velocity

(2) A charge at rest

(3) A charge moving in a circular orbit

(4) Charges cannot produce an EM wave

Subtopic:  Generation of EM Waves |
 74%
From NCERT
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The dimension of E/H is that of 

(1) Impedance

(2) Inductance

(3) capacitance

(4) Inductance×Capacitance

Subtopic:  Properties of EM Waves |
 78%
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Poynting vector P for an EM wave is :

1. P=E×B

2. P=E×H

3. P=EB

4. P=EH

Subtopic:  Properties of EM Waves |
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