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What is produced when current flows through a conducting wire?
A magnetic field around the wire.
What determines the strength of the magnetic field around a current-carrying wire?
Current size and distance from wire.
What is a solenoid?
A coil of wire creating a strong magnetic field when current flows.
Describe the magnetic field inside a solenoid.
Strong and uniform.
What is an electromagnet?
A solenoid with an iron core (increases field strength).