(A) First,calculate the resistance of the galvanometer $(G)$: $G = \frac{V_g}{I_g} = \frac{80 \times 10^{-3} \text{ V}}{16 \times 10^{-3} \text{ A}} =

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(A) First,calculate the resistance of the galvanometer $(G)$: $G = \frac{V_g}{I_g} = \frac{80 \times 10^{-3} \text{ V}}{16 \times 10^{-3} \text{ A}} = 5 \Omega$. To convert a galvanometer into a voltmeter of range $V$,a high resistance $R$ must be connected in series with it. The formula for the series resistance is $R = \frac{V}{I_g} - G$. Given $V = 160 \text{ V}$ and $I_g = 16 \times 10^{-3} \text{ A}$: $R = \frac{160}{16 \times 10^{-3}} - 5 = 10000 - 5 = 9995 \Omega$. Thus,a resistance of $9995 \Omega$ must be connected in series.

Class 12 Physics Moving Charges and Magnetism The Moving Coil Galvanometer (Sensitivity) and Ammeter and Voltmeter Conversion

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The scale of a galvanometer is divided into $160$ equal divisions. The galvanometer shows full scale deflection of $16$ mA and maximum voltage is $80$ mV. Now the range is changed so that the galvanometer reads $160$ $V$. The required resistance to be connected is

MHT CET 2025 All MHT CET

A
$9995 \Omega$ in series.
B
$4995 \Omega$ in series.
C
$9.5 \times 10^{-3} \Omega$ in parallel.
D
$4.95 \times 10^{-3} \Omega$ in parallel.

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Moving Charges and Magnetism

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The Moving Coil Galvanometer (Sensitivity) and Ammeter and Voltmeter Conversion

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How can we convert a galvanometer into an ammeter?

Easy

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Explain the difficulties encountered when using a galvanometer directly as an ammeter.

Medium

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When a $12\,\Omega$ resistor is connected in parallel with a moving coil galvanometer,its deflection reduces from $50$ divisions to $10$ divisions. The resistance of the galvanometer is ............. $\Omega$.

Medium

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$A$ voltmeter has a resistance of $2000 \, \Omega$ and it can measure up to $2 \, V$. If we want to increase its range to $10 \, V$, then the required resistance in series will be ........... $\Omega$.

Medium

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$A$ galvanometer is used in the laboratory for the null point in electrical experiments. If,on passing a current of $6 \, mA$,it produces a deflection of $2^{\circ}$,its figure of merit is close to:

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The scale of a galvanometer is divided into $160$ equal divisions. The galvanometer shows full scale deflection of $16$ mA and maximum voltage is $80$ mV. Now the range is changed so that the galvanometer reads $160$ $V$. The required resistance to be connected is

Similar Questions

How can we convert a galvanometer into an ammeter?

Explain the difficulties encountered when using a galvanometer directly as an ammeter.

When a $12\,\Omega$ resistor is connected in parallel with a moving coil galvanometer,its deflection reduces from $50$ divisions to $10$ divisions. The resistance of the galvanometer is ............. $\Omega$.

$A$ voltmeter has a resistance of $2000 \, \Omega$ and it can measure up to $2 \, V$. If we want to increase its range to $10 \, V$, then the required resistance in series will be ........... $\Omega$.

$A$ galvanometer is used in the laboratory for the null point in electrical experiments. If,on passing a current of $6 \, mA$,it produces a deflection of $2^{\circ}$,its figure of merit is close to:

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