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Twelve wire, each having equal resistanc...

Twelve wire, each having equal resistance r, are joined to form a cube as shown in figure.Find the equivalent resistance between the diagonally opposite points a and `f`.

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Taking circuit ABFGA,
i/3r + i/6r + i/3r = V
` rArr (2i/3r + i/6r) = V `
` rArr (5i/6r) = V `
` rArr R_eff = V/i=5/6r.`
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HC VERMA-ELECTRIC CURRENT IN CONDUCTORS-Exercises
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  2. Consider the circuit shown in figure.Find (a) the current in the circu...

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  14. A 6-volt battery of negligible internal resistance is connected across...

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