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1. A material \(B\) has twice the specific resistance of \(A\). A circular wore made of \(B\) has twice the diameter of a wire made of \(A\). Then for the two wires to have the same resistance, the ratio \(\frac{l_B}{ l_A}\) of their respective lengths must be:
2. When a piece of wire of resistance \(R\) is joined end to end with an identical wire, the resistance of the new wire is \(R_1\), say; when these wires are joined in parallel the new resistance is \(R_2\). Then \(\frac{R_1}{R_2}\ =\)
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