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NEET2011PhysicsCurrent ElectricityActual

A galvanometer of resistance, G is shunted by a resistance S ~ohm . To keep the main current in the circuit unchanged, the resistance to be put in series with the galvanometer is

Options

  1. AS^2 (S+G)
  2. BS G (S+G)
  3. CG^2 (S+G)
  4. DG (S+G)

Correct answer

C. G^2 (S+G)

Step-by-step solution

Current will be unchanged if resistance remains same so aligned & G= G S G+S +R & R=G- G S G+S & R= G^2 G+S aligned

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