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Mini-Quiz: Moving Electrical Charges Create Magnetic Field

by Ron Kurtus (revised 23 March 2012)

Take this Mini-Quiz to check your understanding of the lesson material.



1. How do iron filings prove there is a magnetic field around an electric wire?

They form a circular pattern as soon as the electricity is turned on

The filings fly off the card when the current is turned on

They don't prove anything, because it is a magic trick

2. What are the conventions for electric current and magnetic fields?

Current goes from (−) to (+) and the magnetic field goes from N to S

Current goes from (+) to (−) and the magnetic field goes from S to N

Current goes from (+) to (−) and the magnetic field goes from N to S

3. What does placing compasses around an electric wire prove?

You can tell which way is North

You can see the direction of the magnetic field when the current is flowing

You can see the magnetic field whether the current is flowing or not

If you got all three correct, you are on your way to becoming a Champion in Physics. If you had problems, you had better look over the material again.


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