Electromagnetic waves travel only through:
Correct answer: D. All
- A. Material medium
- B. Vacuum
- C. Oscillating electric and magnetic field
- D. All
Explanation
Electromagnetic waves can propagate through a vacuum and do not need a material medium for their transmission. They consist of oscillating electric and magnetic fields that are perpendicular to each other and to the direction of wave propagation. Thus, although options A, B,and C may contain partial truths, they do not fully capture the breadth of how electromagnetic waves propagate. Therefore, the correct answer is 'All' since it encompasses all the mentioned forms of propagation.
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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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