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Further detail
1. A compass needle deflects near a current-carrying wire but returns to its original direction when the current stops; what does this show about the wire’s magnetic effect?
2. What is meant by the magnetic effect of electric current?
3. The region where a magnet’s or a current-carrying wire’s magnetic effect can be detected, for example by compass deflection, is called what?
What happens to a compass needle near a current-carrying wire?
It deflects.
What is the magnetic effect of electric current?
The production of a magnetic field around a conductor.
What happens when current stops in the wire?
The magnetic effect disappears.
In which year did Oersted make his discovery?
1820.
What is the region of detectable magnetic effect called?
A magnetic field.
What is a compass needle?
A tiny magnet.
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