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Double Jumping Rings

An experiment where a brass ring and aluminium ring are placed together on an electromagnet.

Sample examination question - 2001 HSC Examination

A light rod has a coil of insulated copper wire fixed at one end and is pivoted at the other end. The result is a pendulum which is free to swing back and forth. A magnet is placed underneath this pendulum.

The pendulum is pulled back and then allowed to swing. Which of the following would cause the pendulum to come to rest more quickly?

A. Replacing the magnet with a stronger one B. Shortening the pendulum C. Replacing the rod with a heavier one D. Connecting the end of the coil by a piece of copper wire

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Double Jumping Rings

Motors & Generators

9.3.2.2.7

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