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The electric and the magnetic field associated with an E.M. wave, propagating along the +z-axis, can be represented by:

1. [E̅ = E₀î, B̅ = B₀ĵ]
2. [E̅ = E₀k̂, B̅ = B₀î]
3. [E̅ = E₀ĵ, B̅ = B₀k̂]
4. [E̅ = E₀k̂, B̅ = B₀k̂]

Correct answer: [E̅ = E₀î, B̅ = B₀ĵ]

Solution

In an electromagnetic wave propagating along the +z-axis, the electric field (E̅) and magnetic field (B̅) are perpendicular to each other and to the direction of propagation. Here, E̅ = E₀î and B̅ = B₀ĵ satisfy this condition.

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