JEE Main 2016 · 3 Apr · Shift 1 · Physics Q27

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PhysicsSingle correct+4 / -1Question 27 of 90

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 :

0.01 Ω

2 Ω

0.1 Ω

3 Ω

Answer and worked solution

Official answer: A

$S=\dfrac{I_gG}{I-I_g}=\dfrac{10^{-3}\times100}{10-0.001}\approx0.01$ Ω.

Topics:Moving coil galvanometer Ammeters and voltmeters

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JEE Main 2016 · 3 Apr · Shift 1, Physics question 27