plss answer to that17 & 18
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17. A is North Pole and B is South Pole
18. Tungsten has a veery high melting point, so a it will melt only in case a very high amount of current passes through the circuit. But for lower ranges of current which yet might be harmful for appliances will not be cut off by a tungsten fuse. So it cannot be used in a fuse wire.
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