[填空题]
The potential difference w z9f1um+u sac 9 oakc3m;fx1rg77*lu (u- c4xl(5- i pyyepkdh;*9pas$V$) across a resistor is measured with a digital voltmeter to be $0.10 \; V$ . What is the percentage uncertainty in $V^2$ ? % (please only input numerical value without units and without the $\pm$ symbol.)
参考答案: 20.00
本题详细解析: The voltmeter is a digital device and so the uncertainty is the smallee6axh:f xi fk 2)+)qlest value which it canfx2 x elkfi)aqe+:6h) record, $0.01 \mathrm{~V}$. This is a $10 \%$ uncertainty on the $0.10 \mathrm{~V}$ measurement. The uncertainty in $V^2$ will be twice this, giving $20 \%$.
Post time 2024-8-21 21:38:19