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Electromagnetic Waves MCQs for NEET — Physics Questions with Answers

Practice free Electromagnetic Waves (Physics) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.

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Which one statement is incorrect about the electromagnetic waves?

$\vec{E} \times \vec{B}$ gives always the direction of propagation

$\vec{E}$ is always perpendicular to $\vec{B}$

Transverse in nature

$\vec{E}$ is always parallel to $\vec{B}$

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Explanation

$\vec{E} i s a l w a y s p e r p e n d i c u l a r t o \vec{B} .$

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Instantaneous displacement current of 2.0 A is set up in the space between two parallel plates of 1 $μ F$ capacitor. The rate of change in potential difference across the capacitor is-

$3 \times 10^{6} v / s$

$4 \times 10^{6} v / s$

$2 \times 10^{6} v / s$

none of these

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Explanation

$I_{D} = ε_{0} \frac{{dϕ}_{E}}{dt} = ε_{0} \frac{d (EA)}{dt} = ε_{0} \frac{A}{d} \frac{d (V)}{dt} = C \frac{dV}{dt} \frac{dV}{dt} = \frac{2}{10^{- 6}} = 2 \times 10^{6} V / \sec$

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Which of the following have zero average value in a plane electromagnetic wave?

electric field

magnetic field

magnetic & electric field both

none of these

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Explanation

Both magnetic as well as electric fields in EM waves are sinusoidal in nature and we know that the average value of the sinusoidal wave is zero. Hence, both magnetic and electric fields have zero average value in a plane EM wave.

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Which one statement is incorrect?

Speed of light in free space = $\frac{1}{\sqrt{μ_{0} \in_{0}}}$

Speed of light in medium = $\frac{1}{\sqrt{μ \in}}$

$\frac{E_{0}}{B_{0}} = c$

$\frac{B_{0}}{E_{0}} = c$

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Explanation

All are correct except .

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In a plane electromagnetic wave propagating in space has an electric field of amplitude $9 \times 10^{3}$ V/m, then the amplitude of the magnetic field is

$2.7 \times 10^{12} T$

$9.0 \times 10^{- 3} T$

$3.0 \times 10^{- 4} T$

$3.0 \times 10^{- 5} T$

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Explanation

$A s E_{0} = C B_{0} B_{0} = \frac{E_{0}}{C} = \frac{9 \times 10^{3}}{3 \times 10^{8}} = 3 \times 10^{- 5} T$

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A radiowave has a maximum magnetic field induction of $10^{- 4}$ T on arrival at a receiving antenna. The maximum electric field intensity of such a wave is

zero

$3 \times 10^{4} V / m$

$5.8 \times 10^{- 9} V / m$

$3.3 \times 10^{13} V / m$

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Explanation

$A s w e k n o w, E_{0} = c B_{0} = 3 \times 10^{4} V / m$

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A capacitor is having a capacity of 2 pF. The electric field across the capacitor is changing with a value of $10^{12}$ V/s. The displacement current is :

2 A

3 A

6 A

9 A

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Explanation

$(1) I_{D} = C \frac{dV}{dt} = 2 \times 10^{- 12} \times 10^{12} = 2 A$

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The shortest wavelength is for

$γ$ -rays

X-rays

ultraviolet rays

microwaves

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Explanation

$γ$ -rays have the shortest wavelength.

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An accelerated charge :

emits an electromagnetic wave

does not emit electromagnetic wave

produces a gravitational field

None of these

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Explanation

An accelerated charge produces an electric field as well as a magnetic field.

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The electromagnetic radiations are in descending order of wavelength in the following sequences :

infra-red waves, radio waves, X-rays, visible light rays

Radio-waves, infra-red waves, visible light rays, X-rays

Radio waves, visible light rays, infra-red waves, X-rays

X-rays, visible light rays, infra-red wave, radio-waves

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Explanation

The correct order is; radio-waves, infra-red waves, visible light rays, X-rays.

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