1) A galvanometer having a coil resistance of 100 Ω gives a full-scale deflection when a current of 1 mA is passed through it. The value of the resistance which can convert this galvanometer into ammeter giving a full-scale deflection for a current of 10 A is A) 0.01Ω B) 2Ω C) 0.1Ω D) 3Ω Answer: Option AExplanation: In parallel, current distributes in inverse ratio of resistance Hence, l−lglg=GS⇒S=GIgI−Ig As Ig is very small, hence S=GIgI b=(100)(1×10−3)10=0.01 Ω