Which of these materials can be used to make the needle of a compass?

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Copper

Aluminum

Steel

Gold

answer is C.

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Detailed Solution

Steel is the magnetic material that can be used to make the compass needle.
Compasses are devices used in detecting directions. The needle of the compass always points northward. This is because this needle aligns itself with the earth's magnetic. The magnetic compass needle is made up of metallic substances like steel. Steel is an alloy of iron which can be magnetized for an extended period.

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