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The electric field of an electromagnetic wave in free space is E G = 57 cos[7.5 × 10 6 t – 5 × 10 –3 (3x + 4y)] (4 i ˆ – 3 j ˆ ) N/C. The associated magnetic field in Tesla is-

1. B G = ) k ˆ 5 ( )] y 4 x 3 ( 10 5 t 10 5 . 7 cos[ 10 3 57 3 6 8 + × − × × −
2. B G = ) k ˆ ( )] y 4 x 3 ( 10 5 t 10 5 . 7 cos[ 10 3 57 3 6 8 + × − × × −
3. B G = ) k ˆ 5 ( )] y 4 x 3 ( 10 5 t 10 5 . 7 cos[ 10 3 57 3 6 8 + × − × × − −
4. B G = ) k ˆ ( )] y 4 x 3 ( 10 5 t 10 5 . 7 cos[ 10 3 57 3 6 8 + × − × × − −

Correct answer: B G = ) k ˆ 5 ( )] y 4 x 3 ( 10 5 t 10 5 . 7 cos[ 10 3 57 3 6 8 + × − × × − −

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