Physics-
General
Easy

Question

What is the equivalent resistance between A blank a n d blank B in the given circuit?

  1. 4 capital omega    
  2. 2 capital omega    
  3. fraction numerator 8 over denominator 3 end fraction capital omega    
  4. fraction numerator 3 over denominator 8 end fraction capital omega    

The correct answer is: fraction numerator 8 over denominator 3 end fraction capital omega


    R subscript 1 end subscript and R subscript 2 end subscript are in series
    therefore blank R subscript 12 end subscript equals R subscript 1 end subscript plus R subscript 2 end subscript equals 4 capital omega

    R subscript 12 end subscript a n d R subscript 3 end subscript are in parallel
    R subscript 123 end subscript equals fraction numerator R subscript 3 end subscript cross times R subscript 12 end subscript over denominator R subscript 3 end subscript plus R subscript 12 end subscript end fraction
    equals fraction numerator 4 cross times 4 over denominator 4 plus 4 end fraction
    equals 2 capital omega
    R subscript 123 end subscriptand R subscript 4 end subscript are in series
    therefore blank R subscript 1234 end subscript equals R subscript 123 end subscript plus R subscript 4 end subscript
    equals 2 capital omega plus 2 capital omega
    equals 4 capital omega
    R subscript 1234 end subscript and R subscript 5 end subscript are in parallel
    therefore R subscript 12345 end subscript equals 2 capital omega
    R subscript 12345 end subscript and R subscript 6 end subscript are in series
    2 capital omega plus 2 capital omega equals 4 capital omega
    equals R subscript 123456 end subscript
    Now, R subscript 123456 end subscriptand R subscript 7 end subscriptare in parallel
    therefore R subscript c o m b end subscript equals fraction numerator 4 cross times 8 over denominator 4 plus 8 end fraction
    equals fraction numerator 32 over denominator 12 end fraction equals fraction numerator 8 over denominator 3 end fraction capital omega

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