We should not join the free ends of the tester for more than a few seconds give reason
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Now that our tester is working, let us use it to test the various liquids. (Caution: While checking your tester, do not join its free ends for more than a few seconds. ... When the liquid between the two ends of the tester allows the electric current to pass, the circuit of the tester becomes complete.
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above one is copied ........ the correct answer is above
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