Question

2) a) V-I graph for two wires A and B are shown in
the figure. If both the wires are of the same
length and same thickness, which of the two is
made of a material of high resistivity ? Give
justification for your answer.​

Answer 1

Answer:

From the graph, slope of wire A is greater slope =

dx

dy

=VIR=VI= slope

Hence wire A has greater resistance. The heat produced by resistor is given by P=I

2

.RT. It is directly proportional to square of current paring through it resistance and time for which the current passes through the conductor. Hence A wire is made of a material of high resistivity.