When the free ends of a tester are placed in a liquid, the magnetic needle in it shows deflection. What can you say about the conductivity of the liquid.
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When the free ends of a tester are dipped into a solution ,the magnetic needle shows deflection this is because electric current flowing through a wire produce electric current .
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The deflection in the compass needle shows that current is flowing through the wounded wire and hence, through the circuit. The circuit is complete since free ends of the tester are dipped in a solution. The solution is certainly a conducting solution. This is the reason why the compass needle shows a deflection.
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