# Physics Board Examination

Jun 17th, 2015
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1. Two conducting spheres of radii r1 & r2 are at same potential. What is the ratio of charges on the spheres?. 2. Why do we use nitrogen or methane gas in Van-de-Graff generator ? 3. does the drift velocity of electrons in a metallic conductor change, if the length of the conductor is doubled by stretching it

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Work energy and powerIn general work is said to done when a body moves in a certain distance when force is applied to thatbody.Work:The work done by a force acting on the body is defined as the product of the force and the displacementof the body in the direction of the force.Constant Force :If the force is constant and it displaces the body through a distance (s) in the same direction, then workdone.W=FaBut if the displacementmakes an anglethe direction of force; thenwithConstant forcecomponent of displacement along the direction of force =so,work done by the force ,W=Fsi.e. the work done by a force is the scalar product of the force vector and displacement vector.2. Variable Force :If the force is variable, then for infinitely small displacement, the force is assumed constant, so the workdone during small displacementd W = F dx (one dimensional form)Then total work is joined by adding such small amounts of workThis is found in two ways :(i) By integration :Let body be displaced fromAndGraph of integration(ii) By graphical method :If a graph is plotted between force F and displacement x, then work done by the force from= Area enclosed by

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