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COMEDK2014PhysicsCurrent Electricity

The equivalent resistance of the circuit between A and B is

Options

  1. A30
  2. B20
  3. C10
  4. D13.33

Correct answer

D. 13.33

Step-by-step solution

The given circuit diagram is redrawn as Since, R_ A C R_ A D = R_ B C R_ D B Given circuit is balanced Wheatstone bridge, hence 30 resistance is useless. Therefore, aligned R_ A B &=(20+20) |(10+10) &=40 | 20= 40 20 40+20 &= 800 60 = 40 3 =13.33 aligned

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