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Magnetism and the Motor Effect (EdExcel)
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1
What materials are attracted to magnets?
Iron, Steel, Nickel, and Cobalt.
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2
Name a few examples of non-magnetic materials.
Wood, Plastic, Aluminium, and Copper.
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3
What are the two poles of a magnet?
North-seeking pole (N) and South-seeking pole (S).
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4
What happens when like poles of a magnet come together?
They repel each other.
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5
What is a permanent magnet?
A magnet that produces its own persistent magnetic field and retains magnetism over time.
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6
What is an induced magnet?
A material that becomes magnetic when placed in a magnetic field and loses magnetism when removed.
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7
How do magnetic field lines indicate magnetic strength?
The closer the field lines are together, the stronger the magnetic field.
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8
How is the direction of the magnetic field determined?
By the tangent to the field line at that point.
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9
What creates a magnetic field around a wire?
An electric current flowing through the wire.
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10
Which rule is used to determine the direction of the magnetic field around a current-carrying wire?
The Right-Hand Grip Rule.
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11
What is a solenoid?
A coil of insulated wire that enhances the magnetic field effect.
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12
What occurs when a solenoid is wrapped around a ferromagnetic core?
An electromagnet is created, producing a much stronger magnetic field.
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13
What is the motor effect?
The phenomenon where a current-carrying conductor experiences a force in a magnetic field.
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14
What is Fleming's Left-Hand Rule used for?
To determine the direction of the force on a current-carrying conductor in a magnetic field.
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15
What three factors can increase the force on a conductor in a magnetic field?
Increasing magnetic flux density, increasing current, and increasing length of the conductor.
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16
What is the equation for the force on a current-carrying conductor in a magnetic field?
F = B Ă I Ă l.
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17
What are the basic components of a DC motor?
Rotor (Armature), Magnets, Commutator, and Brushes.
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18
What does the commutator do in a DC motor?
It reverses the direction of the current in the coil every half rotation.
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19
What is the purpose of the brushes in a DC motor?
To allow current to flow to the rotating commutator and coil.
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20
How does the commutator ensure continuous rotation in a DC motor?
By reversing the direction of the current which maintains the turning effect in one direction.
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