MCQ
An electromagnetic wave propagating along north has its electric field vector upwards. Its magnetic field vector point towards.
- ANorth
- ✓East
- CWest
- DDownwards
✓
Answer
Correct option: B.
East
Electric field and magnetic field vectors for an electromagnetic wave are cross $-$ field vectors.
So, the direction of an electromagnetic wave is given by the product of electric field vector and magnetic field vector.
According to the question, electric field vector is directed upwards and $\text{EM}$ wave is directed towards North. So, according to the right $-$ hand thumb rule, the magnetic field vector points towards the East.
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