A Very Long Wire

Electricity and Magnetism Level 2

Patrick has a wire so long that it can go to the moon and come back. Patrick made a simple circuit using this wire, a battery, a switch and a light bulb.

How much time will it take for the bulb to start glowing after the switch is closed?

Details and assumptions

  • The distance between Earth and Moon is about \(\SI{384400}{\kilo\meter}\).

  • The resistance of the wire is negligible.


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