Question

Plot a graph showing the variation of current with voltage for the material GaAs. On the graph, mark the region where : (a) resistance is negative, and (b) Ohm's law is obeyed.

The voltage–current readings of a certain material are shown below. Voltage (V): 10 V 20 V 30 V Current (I): 2 A 3 A 4 A The resistance of the material when the voltage is 30 V is: