explain how can a compass needle be used as a teaser
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A compass needle can be used as a tester. It shows deflection for showing the presence of current. However, it cannot be used for the AC currentused at your home.
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Magnetic compass needle could be an alternative tester. We know that when we take a current carrying wire near magnetic compass needle, it shows deflection. Use this property to make a tester of magnetic compass needle.
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