The resistance of an ammeter is 13Ω and its scale is graduated for a current

The Resistance Of An Ammeter Is 13 And Its Scale Physics QuestionThe Resistance Of An Ammeter Is 13 And Its Scale Physics 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

Options

(a) 2Ω
(b) 0.2Ω
(c) 2 kΩ
(d) 20Ω

Correct Answer:

2Ω

Explanation:

We know, I / Is = 1 + G / S
750 / 100 = 1 + 13/S
S = 2Ω

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