A bar magnet approaches a coil [part (a) of figure]. (a) In which direction does current flow

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A bar magnet approaches a coil [part (a) of figure].
(a) In which direction does current flow through the galvanometer as the magnet approaches?
(b) In part (b) of the figure, the magnet is initially at rest inside the coil. It is then pulled out from the left side. In which direction does current flow through the galvanometer as the magnet is pulled away?
(c) In both situations, how does the magnitude of the current depend on the number of turns in the coil? (The resistance of the coil is negligible compared to the resistance of the galvanometer.)
(d) How does the current depend on the speed of the magnet?
(e) How does the magnitude of the current change if two such magnets were used, held together with the north poles together and the south poles together?
(f) How does the magnitude of the current change if two such magnets were used, held together with the opposite poles together?
(g) Would the experiment give similar results if the magnet remains stationary and the coil moves instead? Explain.
(a) (b)
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Physics

ISBN: 978-0077339685

2nd edition

Authors: Alan Giambattista, Betty Richardson, Robert Richardson

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