An induced electric field and a magnetic field exist in a region. The fields are not perpendicular to each other.
Correct answer: B. No electromagnetic wave is passing through the region.
- A. This scenario is impossible.
- B. No electromagnetic wave is passing through the region.
- C. An electromagnetic wave may be passing through the region.
- D. An electromagnetic wave is certainly passing through the region.
Explanation
A defining characteristic of an electromagnetic wave is that the electric field, the magnetic field, and the direction of propagation are all mutually perpendicular. If the E and B fields are not perpendicular, it cannot be a standard electromagnetic wave.
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About Alternating Current
Alternating current varies periodically, so phase relationships become essential when current passes through a resistor, capacitor or inductor. The chapter distinguishes resistance from capacitive and inductive reactance, explains phase lead and lag, and connects changing electric and magnetic fields with the production and properties of electromagnetic waves.
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