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Swapnil Prasad from Kendriya Vidyalaya, asked a question
Subject: Science , asked on 23/6/12

A wire of resistance 9 ohm is bent in a form of equilateral triangle. the equivalent resistance between any two of its vertices will be

EXPERT ANSWER

Somnath Mazumder , Meritnation Expert added an answer, on 23/6/12
1385 helpful votes in Science

Let ABC be the equilateral triangle formed. AB = BC = CA = L (say)

The original length of the wire = 3L, whose resistance is 9 Ω.

Since, resistance is directly proportional to the length, so each side of the triangle have equal resistance.

That is, R AB = R AC = R CA = 3 Ω

Let us find the resistance across A and B.

R AC and R BC are in series, so, they have a combined resistance of 3+3 = 6 Ω

This 6 Ω is in parallel with R AB . So the equivalent resistance across A and B is, R eq = (6×3)/(6+3) = 2 Ω.

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