Physics
Electron microscope works on which of the following principles?

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

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Physics
Railway tracks are banked on curves so that

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

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