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The magnetic field of an E.M. wave is given by ⎥ ⎦ ⎤ ⎢ ⎣ ⎡ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − ω ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ + = c z t sin 30 j ˆ 2 1 i ˆ 2 3 B (S.I. Units) The corresponding electric field in S.I. units is :

1. ⎥ ⎦ ⎤ ⎢ ⎣ ⎡ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − ω ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ − = c z t sin c 30 j ˆ 2 3 i ˆ 2 1 E
2. ⎥ ⎦ ⎤ ⎢ ⎣ ⎡ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − ω ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + = c z t cos c 30 j ˆ 4 1 i ˆ 4 3 E
3. ⎥ ⎦ ⎤ ⎢ ⎣ ⎡ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + ω ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ + = c z t sin c 30 j ˆ 2 3 i ˆ 2 1 E
4. ⎥ ⎦ ⎤ ⎢ ⎣ ⎡ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + ω ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ − = c z t sin c 30 j ˆ 2 1 i ˆ 2 3 E

Correct answer: ⎥ ⎦ ⎤ ⎢ ⎣ ⎡ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − ω ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ − = c z t sin c 30 j ˆ 2 3 i ˆ 2 1 E

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