Current Electricity and Electrical InstrumentHard

Question

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

Options

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C.
D.

Solution

Let resistance R is be put in series with galvanometer G to keep the main current in the circuit unchanged.
∴      
   ⇒
    

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