For a plane electromagnetic wave propagating in the x-direction, which one of the following combinations gives the correct possible directions for the electric field (E) and magnetic field (B) respectively?

1. \(\hat{j}+\hat{k},~-\hat{j}-\hat{k}\)
2. \(-\hat{j}+\hat{k},~-\hat{j}+\hat{k}\)
3. \(\hat{j}+\hat{k},~\hat{j}+\hat{k}\)
4. \(-\hat{j}+\hat{k},~-\hat{j}-\hat{k}\)

Subtopic:  Properties of EM Waves |
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A capacitor of capacitance 'C' is connected across an ac source of voltage V, given by;

V=V0sinωt

The displacement current between the plates of the capacitor would then be given by:

1. Id=V0ωCsinωt

2. Id=V0ωCsinωt

3. Id=V0ωCcosωt

4. Id=V0ωCcosωt

Subtopic:  Displacement Current |
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The ratio of contributions made by the electric field and magnetic field components to the intensity of an electromagnetic wave is: (c = speed of electromagnetic waves)

1.  1 : 1

2.  1 : c

3.  1 : c2

4.  c : 1 

Subtopic:  Properties of EM Waves |
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Light with an average flux of 20 W/cm2 falls on a non-reflecting surface at normal incidence having surface area 20 cm2 . The energy received by the surface during time span of 1 minute is : 

(1) 12 × 103 J

(2) 24 × 103 J

(3) 48 × 103 J

(4) 10 × 103 J

Subtopic:  Properties of EM Waves |
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The E.M wave with the shortest wavelength among the following is:

1.  Ultraviolet rays 

2.  X-rays

3.  Gamma-rays 

4.  Microwaves  

Subtopic:  Electromagnetic Spectrum |
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The magnetic field in a plane electromagnetic wave is given by:

BY = 2×10-7 sin (π×103 x + 3π ×1011 t) T

The wavelength is:

1.  π × 103 m

2.  2 × 10-3 

3.  2 × 103 m

4.  π × 10-3 m

Subtopic:  Properties of EM Waves |
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Which colour of the light has the longest wavelength?

1. violet

2. red

3. blue

4. green

Subtopic:  Electromagnetic Spectrum |
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A parallel plate capacitor of capacitance 20 μF is being charged by a voltage source whose potential is changing at the rate of 3 V/s. The conduction current through the connecting wires, and the displacement current through the plates of the capacitor, would be, respectively:

1. zero, zero

2. zero, 60μA

3. 60μA, 60μA

4. 60μA, zero

Subtopic:  Displacement Current |
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For a transparent medium relative permeability and permittivity, μr and εr are  1.0 and 1.44 respectively. The velocity of light in this medium would be:

1. 2.5×108 m/s

2. 3 ×108 m/s

3. 2.08 ×108 m/s

4. 4.32 ×108 m/s

Subtopic:  Properties of EM Waves |
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Match List - I with List - II.
List -I (Electromagnetic waves) List - II (Wavelength)
(a) AM radio waves (i) \(10^{-10}~\mathrm{m}\)
(b) Microwaves (ii) \(10^{2} \mathrm{~m}\)
(c) Infrared radiations (iii) \(10^{-2} \mathrm{~m}\)
(d) X-rays (iv) \(10^{-4} \mathrm{~m}\)
Choose the correct answer from the options given below:
(a) (b) (c) (d)
1. (ii) (iii) (iv) (i)
2. (iv) (iii) (ii) (i)
3. (iii) (ii) (i) (iv)
4. (iii) (iv) (ii) (i)
Subtopic:  Electromagnetic Spectrum |
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