The resistance of an ammeter is 13Ω and its scale is graduated for a current upto 100 amps. After an additional shunt has been connected to this ammeter it becomes possible to measure currents upto 75

Question

The resistance of an ammeter is 13Ω and its scale is graduated for a current upto 100 amps. After an additional shunt has been connected to this ammeter it becomes possible to measure currents upto 750 amperes by this meter. The value of shunt-resistance is:NEET 2007

TestHub · Accepted Answer

Let the shunt resistance be S. ​ Given: I = 750 A , I g ​ = 100 A , R G ​ = 13Ω From the figure, I g ​ R G ​ = ( I − I g ​ ) S or 100 × 13 = [ 750 − 100 ] S or 1300 = 650 S ∴ S = 1300/650 = 2Ω. ​

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