A coil made of copper suspended from a fixed support is oscillating freely. If a magnetic dipole is brought near the coil, the coil will:
Correct answer: A. Slow down
- A. Slow down
- B. Move faster
- C. Move faster or slow down depending on which magnetic pole is facing the coil
- D. Continue moving unaffected
Explanation
As the magnet approaches the oscillating coil, the changing magnetic flux induces an eddy current in the coil. According to Lenz's law, this induced current creates a magnetic field that opposes the motion causing it, resulting in a damping force that slows the coil down.
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About Electromagnetism
Magnetic flux density and magnetic flux describe the strength of a magnetic field and the field passing through a surface. A charged particle moving through a magnetic field experiences a force perpendicular to its velocity and may follow circular or helical motion, depending on the angle between velocity and field.
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