(B) Given: Galvanometer resistance $G = 100\,\Omega$,full-scale current $I_g = 50\,\mu A = 50 \times 10^{-6}\,A$.For a voltmeter (series resistance $R

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$10\,V$ range with $200\,k\Omega$ resistance in series

(B) Given: Galvanometer resistance $G = 100\,\Omega$,full-scale current $I_g = 50\,\mu A = 50 \times 10^{-6}\,A$.For a voltmeter (series resistance $R$):$R = \frac{V}{I_g} - G = \frac{10}{50 \times 10^{-6}} - 100 = 200,000 - 100 = 199,900\,\Omega \approx 200\,k\Omega$.Thus,option $(b)$ is correct.For an ammeter (shunt resistance $S$):$S = \frac{I_g G}{I - I_g} = \frac{50 \times 10^{-6} \times 100}{10 \times 10^{-3} - 50 \times 10^{-6}} = \frac{5 \times 10^{-3}}{10^{-2} - 0.05 \times 10^{-3}} = \frac{5 \times 10^{-3}}{9.95 \times 10^{-3}} \approx 0.5\,\Omega$.Options $(c)$ and $(d)$ are incorrect.

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

Medium

$A$ microammeter has a resistance of $100\,\Omega$ and a full-scale range of $50\,\mu A$. It can be used as a voltmeter or as a higher-range ammeter provided a resistance is added to it. Pick the correct range and resistance combination.

A
$50\,V$ range with $10\,k\Omega$ resistance in series
B
$10\,V$ range with $200\,k\Omega$ resistance in series
C
$10\,mA$ range with $1\,\Omega$ resistance in parallel
D
$10\,mA$ range with $0.1\,\Omega$ resistance in parallel

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Moving Charges and Magnetism

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

$A$ student connects a voltmeter,an ammeter,and a resistor as shown in the circuit. If the voltmeter reading is $20 \ V$ and the ammeter reading is $4 \ A$,then the resistance $R$ will be:

Medium

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The resistance of an ammeter is $13\, \Omega$ and its scale is graduated for a current up to $100\, A$. After an additional shunt has been connected to this ammeter,it becomes possible to measure currents up to $750\, A$ by this meter. The value of the shunt resistance is:

MediumAIPMT 2007

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The magnets of two suspended coil galvanometers are of the same strength so that they produce identical uniform magnetic fields in the region of the coils. The coil of the first one is in the shape of a square of side $a$ and that of the second one is circular of radius $\frac{a}{\sqrt{\pi}}.$ When the same current is passed through the coils, the ratio of the torque experienced by the first coil to that experienced by the second one is

MediumWBJEE 2017

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An ammeter with a resistance of $2 \,\Omega$ can measure up to $100 \,mA$. What resistance (in $\Omega$) must be connected in series to make it measure up to $5 \,V$?

Easy

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The sensitivity of a galvanometer that measures current is decreased by $\frac{1}{40}$ times by using a shunt resistance of $10 \Omega$. Then,the value of the resistance of the galvanometer is (in $\Omega$)

DifficultAP EAMCET 2013

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$A$ microammeter has a resistance of $100\,\Omega$ and a full-scale range of $50\,\mu A$. It can be used as a voltmeter or as a higher-range ammeter provided a resistance is added to it. Pick the correct range and resistance combination.

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$A$ student connects a voltmeter,an ammeter,and a resistor as shown in the circuit. If the voltmeter reading is $20 \ V$ and the ammeter reading is $4 \ A$,then the resistance $R$ will be:

The resistance of an ammeter is $13\, \Omega$ and its scale is graduated for a current up to $100\, A$. After an additional shunt has been connected to this ammeter,it becomes possible to measure currents up to $750\, A$ by this meter. The value of the shunt resistance is:

An ammeter with a resistance of $2 \,\Omega$ can measure up to $100 \,mA$. What resistance (in $\Omega$) must be connected in series to make it measure up to $5 \,V$?

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