What's the method Pupin invented to improve long-distance telecommunication?
Placing loading coils at intervals
Using a larger cable
Using stronger electric signals
None of the above
Answer
The method Pupin invented to improve long-distance telecommunication is called loading coils. These are coils of wire that are placed at intervals along the length of a transmission line. They serve to increase the inductance of the line, which in turn reduces the attenuation of the signal. This makes it possible to transmit signals over longer distances without losing too much of their strength.
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