Wire C and wire D are made from different materials and have length LC = LD = 1.

Question

Wire C and wire D are made from different materials and have length LC = LD = 1.0 m. The resistivity and diameter of wire C are 2.00 x 10^-6 ohmm and 1.90 mm, and those of wire D are 1.40 x 10^-6 ohmm and 0.30 mm. The wires are joined as shown in in the figure, and a current of 2.0A is set up in them (a) What is the electric potential difference betweenpoints 1 and 2? 1.411 V (b) What is the electric potential difference between points 2 and3? 39.63 V (c) What is the rate at which energy is dissipated between points 1and 2? 2.822 W (d) What is the rate at which energy is dissipated between points 2and 3? 78.72 W

Explanation / Answer

   to get the resistance we use the equation
   RC = C LC/ rC2
         = ........
   from the ohms law we get the voltage as
   |V1 - V2| =VC

                = i RC
               = ......... V
(b)
   in the similar manner calculate thgeresistance in this part also
(c)
   the power is given by
   PC = i2RC  
        = ......... W
(d)
   PD = i2RD  
        = .........W

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