Physics
Certain substances loose their electrical resistance completely at super low temperature. Such substances are called.

Superconductors
Semi conductors
Dielectrics
Perfect conductors

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Physics
A cyclist leans inwards when he is negotiating a curve so that

His weight may be reduced
He may increase his speed
Necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion.
No frictional force may be produced between the wheels and the axle

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