Magnetic fields can be detected near a magnet or a current-carrying conductor - Leaving Cert Physics - Question 9 - 2017
Question 9
Magnetic fields can be detected near a magnet or a current-carrying conductor.
(i) What is a magnetic field?
(ii) State one example of a good conductor and one e... show full transcript
Worked Solution & Example Answer:Magnetic fields can be detected near a magnet or a current-carrying conductor - Leaving Cert Physics - Question 9 - 2017
Step 1
What is a magnetic field?
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Answer
A magnetic field is a region or space around a magnet where a magnetic force can be felt. It is the area in which magnetic materials experience a force or influence.
Step 2
State one example of a good conductor and one example of a good insulator.
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Answer
One example of a good conductor is copper, while one example of a good insulator is rubber.
Step 3
Name the unit of voltage.
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The unit of voltage is the volt (V).
Step 4
What happens to the wire when current flows through it?
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When current flows through the wire, it experiences a force due to the magnetic field, causing it to move. Additionally, it may get hot due to the resistance encountered.
Step 5
What happens when the direction of the current is reversed?
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When the direction of the current is reversed, the wire moves in the opposite direction compared to its original movement.
Step 6
Name one device based on this effect.
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One device based on this effect is an electric motor.
Step 7
What is observed on the voltmeter when neither the wire nor the magnet move?
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When neither the wire nor the magnet moves, the voltmeter will show no reading or deflection, indicating that there is no induced voltage.
Step 8
What is observed on the voltmeter when either the wire or the magnet is moved?
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When either the wire or the magnet is moved, the voltmeter shows a deflection or reading, indicating that an induced current has been generated.
Step 9
Name a scientist whose law is associated with this phenomenon?
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One scientist whose law is associated with this phenomenon is Michael Faraday, known for Faraday's Law of Electromagnetic Induction.
Step 10
Magnetism is one effect associated with an electric current. Name another effect.
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Another effect associated with an electric current is heating, which can be observed in resistive elements when current passes through them.
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