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Six identical wires of resistance R each are joined to form a pyramid, as shown in the figure above. (a) The equivalent resistance between any two corners will depend on the choice of corners. (b) The equivalent resistance between A and B is R/2 (c) The equivalent resistance between D and C is zero. (d) If an electric current enters at A and flows out at B, no current will pass through DC. |
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Answer» Correct Answer is: (b, d) Use symmetry arguments. If a p.d. is applied between A and B, the paths ADB and ACB become equivalent, while D and C are at the same potential (and hence can be removed from the circuit). |
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