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Question

Four wires A, B, C and D are made of different materials. They each carry the same current I. Wire B has twice the length of other wires. Wire C has twice the internal electric field of other wires. Wire D has twice the diameter of other wires. Other than these differences, all wires share identical characteristics. Rank the conductivities of these materials, from greatest to least

  1. null    
  2. null    
  3. sigma subscript A end subscript equals sigma subscript B end subscript less than sigma subscript C end subscript equals sigma subscript D end subscript    
  4. sigma subscript A end subscript equals sigma subscript B end subscript greater than sigma subscript C end subscript equals sigma subscript D end subscript    

The correct answer is: null

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