alleryWhat do time-varying currents emit that are used in telecommunications?
ASoil vibrations
BHeavy ion beams
CElectromagnetic waves
DSound crystals
Answer & Solution
Correct answer: C. Electromagnetic waves
1. Time-varying currents emit electromagnetic waves.
2. These waves are used in telecommunications to broadcast information.
3. The other options are not emitted this way.
_Source: Wikipedia, Electric current, Lead section_
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