Question

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

Answer 1

Concept: V-IV-I graph obeying ohm's law.
Answer: Wire A
Explanation:
•According to ohm's law, V=IR, R=V/I.
(V-voltage,I-Current,R-Resistance)
•Greater the slope of graph, greater will be the resistance of given wire.
•In the graph, wire A has greater slope than wire B. Hence, wire A has greater resistance.
•For the wires of same length and same thickness, resistance depend upon the nature of material of the wire.
Hence, wire A is the correct answer.
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Answer 2

Answer:

A

Explanation:

V-IV-I graph obeying ohm's law.

•According to ohm's law, V=IR, R=V/I.

(V-voltage,I-Current,R-Resistance)

•Greater the slope of graph, greater will be the resistance of given wire.

•In the graph, wire A has greater slope than wire B. Hence, wire A has greater resistance.

•For the wires of same length and same thickness, resistance depend upon the nature of material of the wire.