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A material '$B$' has twice the specific resistance of '$A$'. A circular wire made of '$B$' has twice the diameter ofa 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
  • A$2$
  • B$1$
  • C$\;\frac{1}{2}$
  • D$\;\frac{1}{4}$
AIEEE 2006, Medium
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