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A light wave is travelling along the y-direction. If the corresponding electric field vector at any time is along the x-axis, the direction of the magnetic field vector at that time is along

1. y-axis
2. x-axis
3. +z-axis
4. -z-axis

Correct answer: -z-axis

Solution

For an electromagnetic wave, the propagation direction is given by \(\vec E \times \vec B\). Here \(\vec E\) is along +x and the wave travels along +y, so \(\vec B\) must be along -z because \(\hat i \times (-\hat k)=\hat j\).

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