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 ex... 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 is experienced. It can influence the motion of charged particles and can be represented using field lines which depict the strength and direction of the magnetic force.
Step 2
State one example of a good conductor and one example of a good insulator.
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A good conductor example is copper, while a good insulator example 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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Answer
When current flows through the wire, it experiences a force due to the magnetic field, causing it to move. Additionally, the wire may get hot due to electrical resistance.
Step 5
What happens when the direction of the current is reversed?
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If the direction of the current is reversed, the wire will move in the opposite direction, changing its motion in response to the magnetic field.
Step 6
Name one device based on this effect.
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One device based on this effect is an electric motor or a galvanometer.
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 move, the voltmeter reads zero, indicating 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, indicating that induced voltage is being generated.
Step 9
Name a scientist whose law is associated with this phenomenon.
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A scientist 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 one other effect.
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One other effect associated with an electric current is heating, commonly referred to as Joule heating.
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