keenbug6 keenbug6

27-02-2017
Physics

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What happens to compass needles when a copper rod is placed at a 90 degree angle in the midst of them and electric current is flowing through the rod?

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osprey2015 osprey2015

27-02-2017

The electric current in the copper rod generates a magnetic field which is circular. The centres of the circles are the copper rod. The already magnetised needles will tend to become aligned with the field of the current in the rod. Presumably, the field of that current is stronger than the earth's magnetic field.

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