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A plane electromagnetic wave of frequency 20 MHz propagates in free space along x-direction. At a particular space and time j ˆ 6 . 6 E   v/m. What is B  at this point?

1. 2.2 × 10 –8 k ˆ T
2. –2.2 × 10 –8 i ˆ T
3. –2.2 × 10 –8 k ˆ T
4. 2.2 × 10 –8 i ˆ T

Correct answer: 2.2 × 10 –8 k ˆ T

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