Question

Why the oscillations of a copper disc in a magnetic field are highly damped?

Answer 1

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The eddy current generated in copper disc always  oppose the mechanical motion.So the oscillations are damped.

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Answer 2

The oscillations of a copper disc in a magnetic field are highly damped because the eddy current occurs in the circulation current.

• This will occur when the conductor in the magnetic field changes its experience but the rate of current is not responsible for doing any useful work.
• The pendulum may break and this causes more kinetic energy to the copper plate which brings the pendulum to rest.
• Opposing direction is an attempt of taking place like the relative motion of the system to resist the changes in charges in the surrounding.