Physics
The nature of fuse wire is

Low resistance and high melting point.
High resistance and low melting point.
High resistance and high melting point.
Low resistance and low melting point.

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Physics
Railway tracks are banked on curves so that

No frictional force may be produced between the tracks and the wheels of the train
Necessary centripetal force may be obtained from the horizontal component of the weight of the train
Necessary centrifugal force may be obtained from the horizontal component of the weight of the train
The train may not fall down inwards

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