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Question

The figure shows a wire mesh of infinite extent, such that the resistance between any two neighbouring vertices is equal. A steady current of 1A flows into the node P, from a current source, while a steady current  of 1A is extracted from the node Q, as shown. Regard the situation as the superposition of two processes: the first in which the current flows into the mesh, and the second in which it flows out of the mesh. The steady current flowing in the segment PQ is equal to 


  1. 2A
  2. 1A
  3. 12A
  4. 14A


Solution

The correct option is C 12A
The directions of the currents in each node is as shown.

 

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