# Ques1) Two square metal plates A and B  are of the same thickness and material. The side of B is twice of that A. These are connected in series. Let the resistances of A and B are denoted by RA and RB. Then show that RA / RB =1.Ques2) A,B,C,D are four points in succession at equal distances along a wire and A,B,C,D are also joined by two ther wires of the same length as the distance b/w those pairs of points measured along the original wire. A current I enters the network thus formed, at A and leaved at D. Show that the electric current in BC is 1/4.Ques3) A potentiometer wire of length 100 cm has  aresitance 10 ohm. It is connected in series with a reisiance and an accumulator of emf 2 V and of negligible reistance. A source of emf 10 mV is balanced against the length of 40 cm of the potentiometer wire. What si the value of the external resistance ?

357 Points
14 years ago

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