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What is electromagnetic induction? Explain how you would use a magnet and a coil, as shown above, to produce electricity - Leaving Cert Physics - Question d - 2018
Question d
What is electromagnetic induction? Explain how you would use a magnet and a coil, as shown above, to produce electricity. How would you know that electrici... show full transcript
Worked Solution & Example Answer:What is electromagnetic induction? Explain how you would use a magnet and a coil, as shown above, to produce electricity - Leaving Cert Physics - Question d - 2018
Step 1
What is electromagnetic induction?
Answer
Electromagnetic induction is the process where an electromotive force (emf) or voltage is generated in a conductor as a result of a change in the magnetic environment of that conductor. This can occur due to the relative motion between a magnet and a coil, which causes a shift in magnetic flux through the coil, thereby inducing a current according to Faraday's Law of electromagnetic induction.
Step 2
Explain how you would use a magnet and a coil, as shown above, to produce electricity.
Answer
To produce electricity using a magnet and a coil, you would move the magnet in and out of the coil. As the magnet approaches the coil, the changing magnetic field creates an induced current in the wire. This can be done by quickly inserting the magnet into the coil and then withdrawing it. A continuous motion can produce a steady current.
Step 3
How would you know that electricity is being produced?
Answer
You would know that electricity is being produced by observing the deflection of a pointer on a galvanometer or ammeter connected to the coil. If the needle moves, it indicates that an electric current is flowing through the circuit, thus confirming the production of electricity.
Step 4
How could you increase the magnitude of the electricity produced?
Answer
The magnitude of the electricity produced can be increased by using a stronger magnet. Additionally, moving the magnet faster or increasing the number of turns in the coil can enhance the induced current. The overall strength of the magnetic field and the speed of its change play critical roles in maximizing the induced electromotive force.
Step 5
The apparatus in the diagram can be used to produce a.c. electricity. What is meant by a.c.?
Answer
A.C. stands for alternating current, which is an electric current that reverses its direction periodically. In contrast to direct current (D.C.), where the current flows in one direction, a.c. varies in magnitude and direction, typically sinusoidally above and below zero voltage. This type of current is commonly used in power supply systems.