Moving Coil Galvanometer

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JEE Advanced 2005

LEVELJEE Advanced

A moving coil galvanometer experiences a torque $= k i$ , where $i$ is current. If $N$ coils of area $A$ each and moment of inertia $I$ is kept in magnetic field $B$ . (2005) (a) Find $k$ in terms of given parameters. (b) If for current $i$ deflection is $\frac{π}{2}$ , find out torsional constant of spring. (c) If a charge $Q$ is passed suddenly through the galvanometer, find out maximum angle of deflection.

LEVELJEE Main

Assertion The sensitivity of a moving coil galvanometer is increased by placing a suitable magnetic material as a core inside the coil. Reason Soft iron has a high magnetic permeability and cannot be easily magnetised or demagnetised.

(A)

If Assertion is true, Reason is true; Reason is the correct explanation for Assertion

(B)

If Assertion is true, Reason is true; Reason is not a correct explanation for Assertion

(C)

If Assertion is true; Reason is false

(D)

If Assertion is false; Reason is true

JEE Advanced 2019

LEVELJEE Advanced

A moving coil galvanometer has 50 turns and each turn has an area $2 \times 1 0^{- 4} m^{2}$ . The magnetic field produced by the magnet inside the galvanometer is $0.02 T$ . The torsional constant of the suspension wire is $1 0^{- 4} N-m rad^{- 1}$ . When a current flows through the galvanometer, a full scale deflection occurs, if the coil rotates by $0.2 rad$ . The resistance of the coil of the galvanometer is $50Ω$ . This galvanometer is to be converted into an ammeter capable of measuring current in the range $0 - 1.0 A$ . For this purpose, a shunt resistance is to be added in parallel to the galvanometer. The value of this shunt resistance in ohms, is ............. .

JEE Main 2019

LEVELJEE Advanced

A galvanometer of resistance $100 Ω$ has 50 divisions on its scale and has sensitivity of $20 μ A/division$ . It is to be converted to a voltmeter with three ranges of 0-2 V, 0-10 V and 0-20 V. The appropriate circuit to do so is

An ammeter reads upto 1 A. Its internal resistance is $0.81 Ω$ . To increase the range to 10 A, the value of the required shunt is

(A)

0.03 Ω

(B)

0.3 Ω

(C)

0.9 Ω

(D)

0.09 Ω

JEE Main 2019

LEVELJEE Main

A moving coil galvanometer has resistance $50 Ω$ and it indicates full deflection at $4 mA$ current. A voltmeter is made using this galvanometer and a $5 k Ω$ resistance. The maximum voltage, that can be measured using this voltmeter, will be close to

(A)

40 V

(B)

10 V

(C)

15 V

(D)

20 V

JEE Main 2019

LEVELJEE Main

A moving coil galvanometer has a coil with $175$ turns and area $1 cm^{2}$ . It uses a torsion band of torsion constant $1 0^{- 6} N-m/rad$ . The coil is placed in a magnetic field $B$ parallel to its plane. The coil deflects by $1^{\circ}$ for a current of $1 mA$ . The value of $B$ (in tesla) is approximately

(A)

1 0^{- 3}

(B)

1 0^{- 4}

(C)

1 0^{- 1}

(D)

1 0^{- 2}

JEE Main 2019

LEVELJEE Main

A galvanometer having a resistance of $20Ω$ and 30 divisions on both sides has figure of merit 0.005 ampere/division. The resistance that should be connected in series such that it can be used as a voltmeter upto 15 volt is

(A)

100Ω

(B)

125Ω

(C)

120Ω

(D)

80Ω

LEVELJEE Main

A moving coil galvanometer has 150 equal divisions. Its current sensitivity is 10 divisions per milliampere and voltage sensitivity is 2 divisions per millivolt. In order that each division reads 1 V, the resistance in Ohms needed to be connected in series with the coil will be

(A)

1 0^{3}

(B)

1 0^{5}

For full scale deflection of total 50 divisions, 50 mV voltage is required in galvanometer. The resistance of galvanometer if its current sensitivity is 2 div/mA will be

(A)

1 Ω

(B)

5 Ω

(C)

4 Ω

(D)

2 Ω

JEE Main 2016

LEVELJEE Main

A galvanometer having a coil resistance of $100 Ω$ gives a full scale deflection when a current of $1 mA$ is passed through it. The value of the resistance which can convert this galvanometer into ammeter giving a full scale deflection for a current of $10 A$ , is

(A)

0.01 Ω

(B)

2 Ω

(C)

0.1 Ω

(D)

3 Ω

JEE Main 2019

LEVELJEE Main

A moving coil galvanometer, having a resistance $G$ , produces full scale deflection when a current $I_{g}$ flows through it. This galvanometer can be converted into (i) an ammeter of range 0 to $I_{0} (I_{0} > I_{g})$ by connecting a shunt resistance $R_{A}$ to it and (ii) into a voltmeter of range 0 to $V (V = G I_{0})$ by connecting a series resistance $R_{V}$ to it. Then,

(A)

R_{A} R_{V} = G^{2} (\frac{I _{0} - I _{g}}{I _{g}})

and

\frac{R _{A}}{R _{V}} = (\frac{I _{g}}{I _{0} - I _{g}})^{2}

(B)

R_{A} R_{V} = G^{2}

and

\frac{R _{A}}{R _{V}} = (\frac{I _{g}}{I _{0} - I _{g}})^{2}

(C)

R_{A} R_{V} = G^{2} (\frac{I _{g}}{I _{0} - I _{g}})

and

\frac{R _{A}}{R _{V}} = (\frac{I _{0} - I _{g}}{I _{g}})^{2}

(D)

R_{A} R_{V} = G^{2}

and

\frac{R _{A}}{R _{V}} = (\frac{I _{0} - I _{g}}{I _{g}})^{2}

JEE Main 2021

LEVELJEE Main

Consider a galvanometer shunted with $5 Ω$ resistance and $2%$ of current passes through it. What is the resistance of the given galvanometer ?

(A)

300 Ω

(B)

344 Ω

(C)

245 Ω

(D)

226 Ω

JEE Main 2019

LEVELJEE Main

A moving coil galvanometer allows a full scale current of $1 0^{- 4} A$ . A series resistance of $2 M Ω$ is required to convert the above galvanometer into a voltmeter of range $0 - 5 V$ . Therefore, the value of shunt resistance required to convert the above galvanometer into an ammeter of range $0.10 mA$ is

(A)

100 Ω

(B)

500 Ω

(C)

200 Ω

(D)

10 Ω

JEE Main 2020

LEVELJEE Main

A galvanometer coil has 500 turns and each turn has an average area of $3 \times 1 0^{- 4} m^{2}$ . If a torque of $1.5 N-m$ is required to keep this coil parallel to a magnetic field when a current of $0.5 A$ is flowing through it, the strength of the field (in T) is ........... .

JEE Main 2019

LEVELJEE Main

The resistance of a galvanometer is $50 Ω$ and the maximum current which can be passed through it is $0.002 A$ . What resistance must be connected to it in order to convert it into an ammeter of range $0 - 0.5 A$ ?

(A)

0.2 Ω

(B)

0.5 Ω

(C)

0.002 Ω

(D)

0.02 Ω

Assertion The sensitivity of a moving coil galvanometer is increased by placing a suitable magnetic material as a core inside the coil. Reason Soft iron has a high magnetic permeability and cannot be easily magnetised or demagnetised.

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } An ammeter reads upto 1 A. Its internal resistance is 0.81 Ω. To increase the range to 10 A, the value of the required shunt is

A moving coil galvanometer has 150 equal divisions. Its current sensitivity is 10 divisions per milliampere and voltage sensitivity is 2 divisions per millivolt. In order that each division reads 1 V, the resistance in Ohms needed to be connected in series with the coil will be

For full scale deflection of total 50 divisions, 50 mV voltage is required in galvanometer. The resistance of galvanometer if its current sensitivity is 2 div/mA will be

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } Consider a galvanometer shunted with 5 Ω resistance and 2% of current passes through it. What is the resistance of the given galvanometer ?

An ammeter reads upto 1 A. Its internal resistance is $0.81 Ω$ . To increase the range to 10 A, the value of the required shunt is

Consider a galvanometer shunted with $5 Ω$ resistance and $2%$ of current passes through it. What is the resistance of the given galvanometer ?