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Chapter 15: Problem 2199

Electromagnetic wave is produced by oscillating electric and magnetic fields \(E^{-}\) and \(B^{-}\). Choose only the incorrect statement from the following (A) \(\mathrm{E}^{-}\) is perpendicular to \(\mathrm{B}^{-}\). (B) \(E^{-}\) is perpendicular to the direction of propagation of the wave (C) \(\mathrm{B}^{-}\) is perpendicular to the direction of propagation of the wave (D) \(E^{-}\) is parallel to \(\mathrm{B}^{-}\)

Short Answer

Expert verified
The incorrect statement is (D) \(E^-\) is parallel to \(B^-\), as electric and magnetic fields in electromagnetic waves are always perpendicular to each other, not parallel.

Step by step solution

01

Statement A

\(E^- \) is perpendicular to \(B^-\). This statement is true as electric and magnetic fields in electromagnetic waves are always perpendicular to each other. They both oscillate at right angles to one another.
02

Statement B

\(E^-\) is perpendicular to the direction of propagation of the wave. This statement is also true. The electric field oscillates at a right angle to the direction of the wave's propagation.
03

Statement C

\(B^-\) is perpendicular to the direction of propagation of the wave. This statement is correct as well. The magnetic field also oscillates at a right angle to the direction of the wave's propagation.
04

Statement D

\(E^-\) is parallel to \(B^-\). This statement is false. As mentioned earlier, the electric and magnetic fields in electromagnetic waves are always perpendicular to each other, not parallel. Thus, the incorrect statement is (D) \(E^-\) is parallel to \(B^-\).

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Most popular questions from this chapter

In a plane electromagnetic wave, the electric field oscillates sinusoidaly at a frequency of \(2.0 \times 10^{10} \mathrm{~Hz}\). if the peak value of electric field is \(60 \mathrm{Vm}^{-1}\) the average energy density (in \(\mathrm{Jm}^{-3}\) ) of the magnetic field of the wave will be (given \(\left.\mu_{0}=4 \pi \times 10^{-7} \mathrm{Tm} / \mathrm{A}\right)\) (A) \(2 \pi \times 10^{-7}\) (B) \((1 / 2 \pi) \times 10^{-7}\) (C) \(4 \pi \times 10^{-7}\) (D) \((1 / 4 \pi) \times 10^{-7}\)

The maximum electric field in a plane electromagnetic wave is $900 \mathrm{NC}^{-1}\(. The wave is going in the \)\mathrm{x}$ direction and the electric field is in the y direction. The maximum magnetic field in the wave is \(\mathrm{T}\) (A) \(3 \times 10^{-8}\) (B) \(3 \overline{\times 10^{-6}}\) (C) \(27 \times 10^{-6}\) (D) $27 \times 10^{10}$

Which of the following have zero average value in a plane electromagnetic wave? (A) Electric energy (B) Magnetic energy (C) Electric field (D) None of these.

The oscillating electric and magnetic field vectors of an electromagnetic waves far away from source are oriented along (A) Mutually perpendicular direction and differ in phase by \(90^{\circ}\) (B) Mutually perpendicular and in same phase (C) In same direction and in same phase (D) In same direction and differ in phase by \(90^{\circ}\)

The frequency of electromagnetic wave having wavelength \(25 \mathrm{~mm}\) is \(\quad \mathrm{Hz}\) (A) \(1.2 \times \overline{10^{10}}\) (B) \(7.5 \times 10^{5}\) (C) \(1.2 \times 10^{8}\) (D) \(7.5 \times 10^{6}\)
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