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;

$\mathrm{V}={\mathrm{V}}_{0}\mathrm{sin\omega t}$

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

1. ${\mathrm{I}}_{\mathrm{d}}=\frac{{\mathrm{V}}_{0}}{\mathrm{\omega C}}\mathrm{sin\omega t}$

2. ${\mathrm{I}}_{\mathrm{d}}={\mathrm{V}}_{0}\mathrm{\omega Csin\omega t}$

3. ${\mathrm{I}}_{\mathrm{d}}={\mathrm{V}}_{0}\mathrm{\omega Ccos\omega t}$

4. ${\mathrm{I}}_{\mathrm{d}}=\frac{{\mathrm{V}}_{0}}{\mathrm{\omega C}}\mathrm{cos\omega t}$

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 : ${c}^{2}$

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 $×$

(2) 24 $×$

(3) 48 $×$

(4) 10 $×$

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:

The wavelength is:

1.

2.

3.

4.

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 $\mu$F 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, 60$\mu$A

3. 60$\mu$A, 60$\mu$A

4. 60$\mu$A, zero

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

1. 2.5$×{10}^{8}$ m/s

2. 3 $×{10}^{8}$ m/s

3. 2.08 $×{10}^{8}$ m/s

4. 4.32 $×{10}^{8}$ 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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