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NEET2009PhysicsCurrent ElectricityActual

A galvanometer having a coil resistance of 60 shows full scale deflection when a current of 1.0 amp passes through it. It can be converted into an ammeter to read currents upto 5.0 amp by :

Options

  1. APutting in parallel a resistance of 15
  2. BPutting in parallel a resistance of 240
  3. CPutting in series a resistance of 15
  4. DPutting in series a resistance of 240

Correct answer

A. Putting in parallel a resistance of 15

Step-by-step solution

aligned Ig & =1.0 ~A , G =60 q , I =5.0 ~A ~S & = I _ g I - I _ g G G & = 1.0 5.0-1.0 =60 & =15 in parallel aligned

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