how can you prove conducting properties of substance when current is very small and bulb does not glow?
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When the liquid between the two ends of the tester allows the electric current to pass, the circuit of the tester becomes complete. The current flows in the circuit and the bulb glows. When the liquid does not allow the electric current to pass, the circuit of the tester is not complete and the bulb does not glow.
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when current is very small and bulb does not glow we use magnetic compass to detect conduction of current. (◍•ᴗ•◍)❤
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