Physics
On which of the following techniques photostate machine works ?

Electrostatic Image—Making
Thermal Image—Making
Electromagnetic Image— Making
Magnetic Image—Making

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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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