Topic: EM waves, characteristics and transverse nature· Electromagnetic Waves

An em wave is propagating in a medium with a velocity V=V i. The instantaneous oscillating electric field of this em wave is along +y axis. Then the direction of oscillating magnetic field of the em wave will be along

1. \(-\) z direction

2. \(-\) y direction

3. + z direction

4. \(-\) x direction

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Answer: 3. + z direction

In an em wave, \(\vec E\), \(\vec B\) and the direction of propagation are mutually perpendicular, and \(\vec E\times\vec B\) points along the propagation direction.

Propagation is \(+\hat i\) and \(\vec E\) is along \(+\hat j\). We need \(\hat j\times\hat B=\hat i\). Since \(\hat j\times\hat k=\hat i\), \(\vec B\) is along \(+z\).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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An em wave is propagating in a medium with a velocity V=V i. The instantaneous oscillating electric field of this em wave is along +y axis. Then the direction of oscillating magnetic field of the em wave will be along

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