Physics
Electron microscope works on which of the following principles?

Faraday's law of Electromagnetic induction
Wave Nature of electrons
Optical interference
Motion of charged particle in electromagnetic fields

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Physics
Railway tracks are banked on curves

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
to avoid frictional force between the tracks and wheels

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