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Figure 20 shows a magnet and a coil - Edexcel - GCSE Physics - Question 10 - 2022 - Paper 1
Question 10
Figure 20 shows a magnet and a coil. The coil is connected to a sensitive centre-zero ammeter. Explain what will be observed on the meter when the magnet is pushed... show full transcript
Worked Solution & Example Answer:Figure 20 shows a magnet and a coil - Edexcel - GCSE Physics - Question 10 - 2022 - Paper 1
Step 1
Explain what will be observed on the meter when the magnet is pushed in and pulled out of the coil, repeatedly.
Answer
When the magnet is pushed into the coil, it will induce an electric current due to electromagnetic induction. This change in magnetic flux through the coil will cause the ammeter needle to deflect in one direction, indicating a positive reading.
As the magnet is pulled out of the coil, the magnetic flux will decrease, and consequently, the current will also change direction, resulting in the ammeter needle deflecting in the opposite direction, indicating a negative reading. This back-and-forth motion will create a continuous oscillation of the meter's needle, illustrating the principle of induced EMF (electromotive force) in response to the changing magnetic field.