The diagram below represents a simplified diagram of an electronic device connected to a light bulb - NSC Technical Sciences - Question 10 - 2023 - Paper 1
Question 10
The diagram below represents a simplified diagram of an electronic device connected to a light bulb.
How would EACH of the changes below affect the brightness of th... show full transcript
Worked Solution & Example Answer:The diagram below represents a simplified diagram of an electronic device connected to a light bulb - NSC Technical Sciences - Question 10 - 2023 - Paper 1
Step 1
10.1 A weaker magnet is used.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Using a weaker magnet will decrease the strength of the magnetic field. As a result, the induced current in the coil will be reduced, leading to a decrease in the brightness of the bulb.
Step 2
10.2 A coil is rotated faster.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
By rotating the coil faster, the rate at which the magnetic field lines are cut increases. This results in a greater induced current in the coil, therefore the brightness of the bulb will increase.
Step 3
10.3 The number of turns in the coil is increased.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Increasing the number of turns in the coil enhances the amount of induced voltage according to Faraday's law of electromagnetic induction, which leads to a higher induced current. Thus, the brightness of the bulb will also increase.
