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Two metal spheres, each of mass 1 gm and?
radius 0.5 cm are placed on a smooth, horizontal, insulated plate such that their centres are 15 cm apart. One is charged to a potential 500 volt and the other to 1000 volt. What is the velocity of each sphere when they drift away to a distance of 30 cm. between their centres -
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A straight horizontal rod A of mass 50 gm and length 0.5 m,?
is placed in a uniform horizontal magnetic field of 0.2 T, perpendicular to A. Calculate the current in A if the force acting on it just balances it weight.