As the magnet approaches the coil, magnetic flux increases and hence an increased induced current and emf. Therefore, the bulb shines more brightly.
Consider a situation with changing flux. Starting from the far left of the screen, move the magnet to the right so it goes through the middle of the two loops coil at a constant speed and out to the right of the coil.
How does the brightness of the light bulb change if the magnet is moved through the coil more quickly?
a) The bulb shines with the same brightness, but for a shorter duration.
b) The bulb shines more brightly.
c) The bulb shines less brightly.
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