alleryAccording to Ohm's law, the resistance R of a conductor is best described by which statement?
AR is the slope of the I versus V graph
BR is the ratio V/I for the conductor
CR is the product of V and I
DR is independent of the material used
Answer & Solution
Correct answer: B. R is the ratio V/I for the conductor
1. Ohm's law states $V \propto I$, written $V = RI$.
2. Rearranging gives $R = V/I$, the constant of proportionality.
3. R depends on both material and dimensions, so D is wrong.
4. R is the slope of V versus I (not I versus V), so A is wrong; C is dimensionally meaningless.
_Source: syllabus Physics Ch 3 "Current Electricity", p.2_
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