Kognity IB Physics A.0 Measurements & Uncertainty (id: e2aabeaac)

[单选题]
The resistance $R$, and cross-sectional area $A$, of equal lengths of wire are measured at constant temperature and a graph of $R$ against $\frac{1}{A}$ is plotted. Which one of the following graphs would be obtained if $R$ is directly proportional to $\frac{1}{A}$ and if there is a significant systematic error in the measurement of $R ?$
A. B.

C. D.

A.
B.
C.
D.


参考答案:  A


本题详细解析:
Direct proportionality translates graphically into a straight line going throsrxm(3csd 3:gugh the origin (when one quantity is doubled, the other quantity is also doubled). A systematic error means that each time a measurement is made a fixed amount is either added or subtracted to the value. Hence we would see a linear relationship, but the line would not go through the orig3 m:srxsgd3( cin.