In this problem, we need to know Lenz's law.
Lenz's law states that when a changing magnetic flux generates an emf, the polarity of the induced emf is such that it produces a current whose magnetic field opposes the changes that produced it.
The bar magnet is pushed toward the center of a wire loop. As a consequence, there is a clockwise induced current in the loop. Use lenz's law to explain this:
As the bar magnet approaches the loop,
1. The magnetic flux through the loop is _______________. (increasing/decreasing/staying the same).
2. The induced current creates an induced magnetic field that acts to ____________ (weaken/reinforce) the ____________ (rising/falling) magnetic flux through the loop.
3. The direction of the induced field is therefore _______________ (upwards/downwards) and induced current I in the loop is ____________ (clockwise/counter-clock wise/zero)
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