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NEET PHYSICSEasy

If E⃗\vec{E} and B⃗\vec{B} represent the electric field vector and magnetic field vector, respectively, in an electromagnetic wave then the direction of EM wave is along:

A

E⃗\vec{E}

B

B⃗\vec{B}

C

E⃗×B⃗\vec{E} \times \vec{B}

D

B⃗×E⃗\vec{B} \times \vec{E}

Step-by-Step Solution

  1. Transverse Nature: Electromagnetic waves are transverse in nature. The electric field (E⃗\vec{E}) and magnetic field (B⃗\vec{B}) oscillate perpendicular to each other and perpendicular to the direction of wave propagation.
  2. Direction of Propagation: The direction of propagation of an electromagnetic wave is given by the direction of the Poynting vector, which is defined as S⃗=1μ0(E⃗×B⃗)\vec{S} = \frac{1}{\mu_0} (\vec{E} \times \vec{B}). Therefore, the wave propagates along the vector product E⃗×B⃗\vec{E} \times \vec{B}.
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