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MHT CET 2020 (16 Oct, Shift 1) · Kirchhoff's Laws & Measuring Instruments

Kirchhoff's Laws & Measuring Instruments question from MHT CET 2020 (16 Oct, Shift 1)

Q148MHT CET 2020 · 16 OCT · SHIFT 1Medium

Kirchhoff's Laws & Measuring Instruments

An ammeter of resistance $20\ \Omega$ gives full scale deflection, when $1\text{ mA}$ current flows through it. What is the maximum current that can be measured by connecting 4 resistors each of $16\ \Omega$ in parallel with the ammeter?

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Answer: (a)

Four $16\ \Omega$ in parallel: $S = 4\ \Omega$ .
$I = I_g\left(1 + \dfrac{G}{S}\right) = 1\text{ mA} \times \left(1 + \dfrac{20}{4}\right)$
$I = 6\text{ mA}$ . So the answer is (a).

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