question_answer

  The voltage-current (V-I) graph of a metallic   circuit   at   two   different temperatures  and  is shown in figure. Which of the two temperatures is higher and why?

Answer:

                    Resistance is equal to the slope of I-V graph. Here, slope of graph for temperature is  higher so < resistance of temperature  is higher. Temperature  is higher because resistance is proportional to temperature i.e.,  as