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an1. Silver is the best electricity conductor.
an2. The statement means that, above 57° C temperature, the state of wax will change from solid to liquid.
an3. The electrical conductivity of a wire AB is defined as the least opposition nature or resistance provided by a substance to let the electrons pass freely through them
an4. A is encircled with B as these are the two ends of wire. If a wire has a single end only it's resistance would be infinity, therefore definition of electrical conductivity would not stand as per substantial rates, wire will become an insulator.
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