Electromagnetism
This lesson covers:
- What 'electromagnetism' is, and how it works
- How electromagnetism is created in wires, coils, solenoids, and electromagnets
- The four ways to increase the strength of an electromagnet
Which of the following is correct?
When an electrical current flows through a material, a magnetic field is produced only if that material is a metal
When an electrical current flows through a material, a magnetic field is always produced
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force / current / magnetic
The right hand rule can tell us the direction of the magnetic field induced by a flowing current.
In the right hand rule, the thumb is placed following the same direction as the is travelling, and the fingers are the curled in the direction of the field lines.
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The above diagram shows two wires with current flowing to the right.
Using the right hand grip rule, which of the two shows the correct direction of the magnetic field lines, A or B?
A
B
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The above object can be called:
(Select all that apply)
An electromagnet
A cuboid
A solenoid
A trapezoid
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In an electromagnet, a current is required to produce the magnetic field.
When the current is switched off, the magnetic field:
Remains the same
Disappears
Changes direction
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Describe the four ways to increase the strength of an electromagnet.
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