In a potentiometer experiment, if the area of cross-section of the wire increases uniformly from one end to another, draw a graph showing how potential gradient would vary as the length of the wire increases from one end.
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Potential gradient, `K=V/l = (IR)/l = I/l = (rho l)/A = (I rho)/A` or ` K prop 1/A` Thus the variaton of K versus `l` when A increases from one end to another is of the type.
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