A superconductor is a material that when cooled will allow a massive amount of current to flow through it. Why does this MRI machine use superconducting wires for its electromagnet?
A very strong electromagnet requires massive amounts of current.
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15
What will happen to a north and south pole if they are brought together?
They will attract
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15
Which pole of the Earth's magnetic field is at the "North Pole"?
The south pole
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15
Define the motor effect...
A current carrying wire placed in an external magnetic field will experience a force.
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15
The north pole of a bar magnet is brought towards an Aluminium bar, what happens?
Nothing, Aluminium is non magnetic
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15
What will happen when the bell switch is closed?
The electromagnet will attracted the iron armature which will ring the bell
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15
Explain how the motor effect causes this motor to spin
The left hand side of the coil experiences a downward force, the right hand side of the coil experiences an upward force.
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15
When the activity of the sun is high, charged particles from solar winds can flow along the earth's magnetic field lines and enter the atmosphere near the poles. What visual effect does this create?
The Aurora borealis (northern lights)
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15
The magnetic field lines of a bar magnet are invisible to us. What could you use to visualise the field?
Sprinkle iron filings into the field or use a compass needle in the field.
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15
What happens to the strength of the magnetic field created by a current carrying wire as you get further from the wire?
