Physics
A transformer

Is used to decrease or increase AC voltage
Converts DC to AC
Converts electrical energy into mechanical energy
Converts AC voltage to D.C. voltage

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Physics
Railway tracks are banked on curves

to avoid frictional force between the tracks and wheels
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 weight of the train
the train may not fly off in the opposite direction

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