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The normal current in a power line is 100 A. If a short-circuit fault occurs on the line, then one can expect the short-circuit current to be

100 A
200 A
more than 1000 A
300 A

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The material used for fuse must have

low melting point and high specific resistance
high melting point and low specific resistance
low melting point and any specific resistance
Low melting point and low specific resistance

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