When the free ends of a tester are dipped into a solution the magnetic needle shows deflection why?
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Because the liquid may be a good conductor of electricity and also because of magnetic effect of electricity
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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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