(B) Given: Resistance of galvanometer $G = 100 \Omega$, Shunt resistance $S = 1 \Omega$, Full-scale deflection current $I_g = 10 \mu A = 10 \times 10^

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(B) Given: Resistance of galvanometer $G = 100 \Omega$, Shunt resistance $S = 1 \Omega$, Full-scale deflection current $I_g = 10 \mu A = 10 \times 10^{-6} A$. To convert a galvanometer into an ammeter, the shunt resistance $S$ is connected in parallel. The total current $I$ required for full-scale deflection is given by the formula: $I = I_g \left( \frac{G+S}{S} \right)$. Substituting the values: $I = 10 \mu A \left( \frac{100 + 1}{1} \right)$. $I = 10 \mu A \times 101 = 1010 \mu A$. Converting to milliamperes: $I = 1.01 \text{ mA}$.

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

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$A$ galvanometer of resistance $100 \Omega$ requires $10 \mu A$ current for full-scale deflection. If a shunt resistance of $1 \Omega$ is connected in parallel to convert it into an ammeter, what is the minimum current required to obtain full-scale deflection (in $\text{ mA}$)?

MHT CET 2020 All MHT CET

A
$101$
B
$1.01$
C
$11.0$
D
$10.1$

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Class 12

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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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$A$ galvanometer of resistance $100 \Omega$ requires $10 \mu A$ current for full-scale deflection. If a shunt resistance of $1 \Omega$ is connected in parallel to convert it into an ammeter, what is the minimum current required to obtain full-scale deflection (in $\text{ mA}$)?

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The current sensitivity of a galvanometer can be increased by:
$(A)$ decreasing the number of turns
$(B)$ increasing the magnetic field
$(C)$ decreasing the area of the coil
$(D)$ decreasing the torsional constant of the spring
Choose the most appropriate answer from the options given below.