First slide

Nature of electromagnetic wave

Question

An electromagnetic wave is travelling to the east. At one instant at a given point its $\vec{E}$ points straight up. What is the direction of $\vec{B}$ ?

Easy

A

North
B

Down
C

East
D

South

Solution

The direction of propagation of electromagnetic wave is given by $\hat{n} = \frac{\vec{E} \times \vec{B}}{|\vec{E} \times \vec{B}|}$ .
As per the given condition, the direction of magnetic field vector will be along south

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