The charge of a parallel plate capacitor is varying as q=q0sinωt. Find the magnitude of displacement current through the capacitor. 
(Plate Area = A, separation of plates = d)

1. q0cos(ωt)

2. q0ωsin ωt

3. q0ωcosωt

4. q0Aωdcosωt

Subtopic:  Displacement Current |
 72%
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An electromagnetic wave is propagating along Y-axis. Then:

(1) The oscillating electric field is along X-axis and the oscillating magnetic field is along Y-axis.

(2) The oscillating electric field is along Z-axis and the oscillating magnetic field is along X-axis.

(3) Both oscillating electric and magnetic fields are along Y-axis, but the phase difference between them is 90°

(4) Both oscillating electric and magnetic fields are mutually perpendicular in arbitrary directions.

Subtopic:  Properties of EM Waves |
 76%
From NCERT
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In electromagnetic wave the phase difference between electric and magnetic field vectors E and B is:

1. 0

2. π/2

3. π

4. π/4

Subtopic:  Properties of EM Waves |
 66%
From NCERT
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An electromagnetic wave going through the vacuum is described by E=E0sin(kx-ωt).

Which is the following is/are independent of the wavelength?

1. \(k\) 2. \(k \over \omega\)
3. \(k \omega\) 4. \( \omega\)
Subtopic:  Properties of EM Waves |
 53%
From NCERT
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In a plane E.M. wave, the electric field oscillates sinusoidally at a frequency of 2.5 ×1010 Hz and amplitude 480 V/m.  The amplitude of the oscillating magnetic field will be:

1. 1.52×10-8 Wb/m2

2. 1.52×10-7 Wb/m2

3. 1.6×10-6 Wb/m2

4. 1.6×10-7 Wb/m2

Subtopic:  Properties of EM Waves |
 74%
From NCERT
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The energy density of the electromagnetic wave in vacuum is given by the relation:

1. 12.E2ε0+B22μ0 

2. 12ε0E2+12μ0B2

3. E2+B2C

4. 12ε0E2+B22μ0

Subtopic:  Properties of EM Waves |
 78%
From NCERT
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A lamp radiates power P0 uniformly in all directions. The amplitude of electric field strength E0 at a distance r from it is:

1. E0=P02πε0cr2

2. E0=P02πε0cr2

3. E0=P04πε0cr2 

4. E0=P08πε0cr

Subtopic:  Properties of EM Waves |
 62%
From NCERT
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The intensity of visible radiation at a distance of 1 m from a bulb of 100 W which converts only 5% of its power into light, is:

1. 0.4 W/m2

2. 0.5 W/m2

3. 0.1 W/m2

4. 0.01 W/m2

Subtopic:  Properties of EM Waves |
 58%
From NCERT
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On an EM wave, the amplitude of electric and magnetic fields are 100 v/m and 0.265 A/m.  The maximum energy flow is

(1) 26.5 W/m2           (2) 46.7 W/m2

(3) 66.5 W/m2            (4) 86.5 W/m2

Subtopic:  Properties of EM Waves |
 61%
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The most penetrating radiation out of the following is: 

(1) X-rays        (2) β-rays            (3) α-rays           (4) γ-rays

Subtopic:  Properties of EM Waves |
 77%
From NCERT
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