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In the following diagram the wheat stone bridge is balanced when we interchange the resistances of
  • A$4\,\Omega $ and $6\,\Omega $
  • B$18\,\Omega $ and $12\,\Omega $
  • C$4\,\Omega $ and $18\,\Omega $
  • D$18\,\Omega $ and $6\,\Omega $
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