QJEEM23Ph26e2: JEE Main 2023 Physics - Class 12 JEEM23Ph26e2 Solution: For designing a voltmeter of range and an ammeter of range…

Question

Verified Solution • 2025–26 Session moderate

For designing a voltmeter of range

50 \mathrm{~V}

and an ammeter of range

10 \mathrm{~mA}

using a galvanometer which has a coil of resistance

54 \Omega

showing a full scale deflection for

1 \mathrm{~mA}

as in figure.

JEE Main 2023 (Online) 15th April Morning Shift Physics - Current Electricity Question 82 English

(A) for voltmeter

R \approx 50 \mathrm{k} \Omega

(B) for ammeter

\mathrm{r} \approx 0.2 \Omega

(C) for ammeter

\mathrm{r}=6 \Omega

(D) for voltmeter

R \approx 5 \mathrm{k} \Omega

(E) for voltmeter

R \approx 500 \Omega

Choose the correct answer from the options given below:

Accepted Answer

For voltmeter

\begin{aligned} R = \frac{V}{I_{g}} - G \\ = \frac{50}{10^{- 3}} - 54 \approx 50 k Ω (A) \end{aligned}

For ammeter

S = \frac{I_{g} G}{I - I_{g}} = \frac{10^{- 3} \times 54}{(10 - 1) \times 10^{- 3}} = 6 Ω (C)

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