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| 1. |
\begin{array} { l } { \text { What length of wire (sp, resistance } 48 \times 10 ^ { - 8 } \text { ohm } m ) \text { ) } } \\ { \text { is needed to make a resistance of } 4.2 \text { ohm } ? } \\ { \text { (Diameter } = 0.4 \mathrm { mm } ) \text { . } } \end{array} |
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