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A galvanometer having a coil of resistance 30 need 20 mA of current for full-scale deflection. If a maximum current of 3 A is to be measured using this galvanometer, the resistance of the shunt to be added to the galvanometer should be 30 X , where X is Options

Options

  1. A596
  2. B149
  3. C298
  4. D447

Correct answer

B. 149

Step-by-step solution

aligned & (I-I_g ) R=I_g G & (3-0.02) R=0.02 G R= 30 149 & 149= Required X aligned

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