The electric and magnetic field of an electromagnetic wave are (a) in opposite phase and perpendicular to each other (b) in opposite phase and parallel to each other (c) in phase and perpendicular to each other (d) in phase and parallel to each other.

Answer: (c). For a plane EM wave E = E₀sin (kx-ω t) and B = B₀sin (kx-ω t): same phase. E and both are perpendicular to the direction of propagation E. So the answer is (c) in phase and perpendicular to each other.

The electric and magnetic field of an electromagnetic wave are | NEET 2007 (AIPMT)

Q89NEET 2007 · AIPMTEasy

Nature of EM Waves & Wave Equation

The electric and magnetic field of an electromagnetic wave are

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Answer: (c)

For a plane EM wave $E = E_0\sin(kx-\omega t)$ and $B = B_0\sin(kx-\omega t)$ : same phase.
$\vec{E}\perp\vec{B}$ and both are perpendicular to the direction of propagation $\vec{E}\times\vec{B}$ .
So the answer is (c) in phase and perpendicular to each other.

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