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COMEDK2020PhysicsCurrent Electricity

If P=Q=R=10 and S=20 , then what resistance should be joined with S to balance the Wheatstone's network?

Options

  1. AJoin a resistance of 10 in series with S
  2. BJoin a resistance of 10 in parallel with S
  3. CJoin a resistance of 20 in parallel with S
  4. DJoin a resistance of 20 in series with S

Correct answer

C. Join a resistance of 20 in parallel with S

Step-by-step solution

The given Wheatstone bridge eircuit is shown belin. Wheatstune is bulanced only when P Q = k ~S Thus, the value of resistance S should be 10 . Hut it is given to 20 . Hence, to decresese its vulue upto 10 , suppose x tesistunce is comnected pantlel to it. 1 10 = 1 20 + 1 x 1 x = 1 10 - 1 20 = 1 20 x=20

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