[填空题]
The potential differe)0 b7/fd jn x0h-vkcupnce *re 7r:al nbrd7 fp ykgc-83*u($V$) across a resistor is measured with a digital voltmeter to be $0.10 \; V$ . What is the percentage uncertainty in $V^2$ ? % (only put numerical values in the blank and keep two significant figures.)
参考答案: 20.00
本题详细解析: The voltmeter is a digital device and so the uncertainty qdg(uvh:fp21lzwh; / is the smallest value which it can (gfpqhl12h w :z/vud ;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 $20 \%$.
