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What is a flaw in a circuit that allows a large current to flow where not wanted called?

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What happens to the steel cylinder on the circuit breaker if a large current flows through the coil?

I take it you mean the iron (rather than steel) core of the solenoid. If the current reaches the limit set, it is attracted against a spring by the resulting magnetic field cr

Current flow a short circuit?

yes the current can flow through a short circuit but there is no voltage because of the zero resistance hence current through the circuit will be infinite The above is of cour

What is required for current to flow in a circuit?

Basically two things   You need basically two things: a complete, closed-loop conductive path and an electro-motive force, that is, a voltage.   Check out this picture