Explain how a magnetic needle and a bulb help in testing the conduction of electricity by different materials. Which of the two is more effective in testing the conduction of electricity by liquids? Give a reason for your answer.
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Explanation:
Magnetic needle shows deflection because of conduction of electricity through the solution. We know that when electric current passes through a conductor, the conductor behaves like a magnet. This is called magnetic effect of electric current.
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