COMEDK · Physics · 19. Current Electricity
The voltage – current graph for a metal wire of uniform area of cross section at two different temp T and T' is shown. Then choose the correct statement:
- A Temperature T' is greater than temperature T
- B Resistance of the conductor at temperature T is greater than resistance of the conductor at temperature T'
- C Resistivity is independent of temperature
- D Temperature T is greater than temperature T'
Answer & Solution
Correct Answer
(A) Temperature T' is greater than temperature T
Step-by-step Solution
Detailed explanation
From Ohm's law, \(V = IR\), which gives \(R = \dfrac{V}{I}\). The given graph is an \(I-V\) plot. The slope of this graph is \(\dfrac{I}{V} = \dfrac{1}{R}\). From the graph, for a given voltage \(V\), the current \(I\) at temperature \(T\) is greater than the current \(I'\) at…
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