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An electromagnetic wave propagating along north lies its electric field vertically upward. The magnetic field vector points towards
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The correct answer is:
east
As the electromagnetic wave is the crossed field of electric and magnetic waves, so the direction of propagation of EM wave is the direction of vector $E \times B$. Here $E$ is upward and $(\mathrm{E} \times \mathrm{B})$ is towards north. So, from right hand thumb rule B will be along east.
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