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The electric field of a plane polarized electromagnetic wave in free space at time t = 0 is given by an expression )] z 8 x 6 [( cos j ˆ 10 ) y , x ( E + = → . The magnetic field ) t , z , x ( B → is given by – (c is the velocity of light)

1. )] ct 10 z 8 x 6 [( cos ) i ˆ 8 k ˆ 6 ( c 1 − + +
2. )] ct 10 z 8 x 6 [( cos ) i ˆ 8 k ˆ 6 ( c 1 − + −
3. )] ct 10 z 8 x 6 [( cos ) i ˆ 8 k ˆ 6 ( c 1 + − +
4. )] ct 10 z 8 x 6 [( cos ) i ˆ 8 k ˆ 6 ( c 1 + + −

Correct answer: )] ct 10 z 8 x 6 [( cos ) i ˆ 8 k ˆ 6 ( c 1 − + −

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