13.The particles which cannot be accelerated by a cyclotron or a Van de Graff generator are :
Alpha particles
Beta particles
Neutrons
Neutrons
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14.A large hollow metallic sphere has a positive charge of 35.4μC at its centre. Find how much electric flux emanates from the sphere.
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15.A current T flows through a metallic wire of radius ‘r’ and the free electrons in it drift with a velocity vd. Calculate the drift velocity of the free electrons through the wire of the same material, having double the radius, when same current flows through it.