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GradeMoving Coil Galvanometer, Moving Coil Galvanometer

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A moving coil galvanometer A has $200$ turns and resistance $100$ Another meter B has $100$ turns and resistance $40$ All the other quantities are same in both the cases. The current sensitivity of

A. B is double as that of A

B. A is $2.5$ times of B

C. A is $5$ times of B

D. B is $5$ times of A

A. B is double as that of A

B. A is $2.5$ times of B

C. A is $5$ times of B

D. B is $5$ times of A

A moving coil galvanometer of resistance \[100{\text{ }}\Omega \] is used as an ammeter using a resistance \[{\text{0}}{\text{.1 }}\Omega \]. The maximum deflection current in the galvanometer is \[100{\text{ }}\mu {A_{}}\]. Find the minimum current in the circuit so that ammeter shows maximum deflection.

A. \[100.1{\text{ mA}}\]

B. \[{\text{1000}}{\text{.1 mA}}\]

C. \[{\text{10}}{\text{.01 mA}}\]

D. \[{\text{1}}{\text{.01 mA}}\]

A. \[100.1{\text{ mA}}\]

B. \[{\text{1000}}{\text{.1 mA}}\]

C. \[{\text{10}}{\text{.01 mA}}\]

D. \[{\text{1}}{\text{.01 mA}}\]

A moving coil galvanometer allows a full scale current of${{10}^{-4}}A$. A series resistance of $2M\Omega $ is required to convert the above galvanometer into a voltmeter of range 0-5V. Therefore the value of shunt resistance required to convert the above galvanometer into an ammeter of range 0-10mA is:

A. $40\Omega $

B. $100\Omega $

C. $10\Omega $

D. $500\Omega $

A. $40\Omega $

B. $100\Omega $

C. $10\Omega $

D. $500\Omega $

(a) Why is the magnetic field radial in a moving coil galvanometer? Explain how it is achieved

(b) A galvanometer of resistance ‘$G$’ can be converted into a voltmeter of range ($0 - V$) volts by connecting a resistance ‘$R$’ in series with it. How much resistance will be required to change its range from $0$ to $\dfrac{V}{2}$?

(b) A galvanometer of resistance ‘$G$’ can be converted into a voltmeter of range ($0 - V$) volts by connecting a resistance ‘$R$’ in series with it. How much resistance will be required to change its range from $0$ to $\dfrac{V}{2}$?

A galvanometer having a resistance of $ 50\Omega $ gives a full scale deflection for a current of $ 0.05A $ . The length in meter of resistance wire of area of cross section $ 2.97 \times {10^{ - 3}}c{m^2} $ that can be used to convert the galvanometer in to an ammeter which can read a maximum of $ 5A $ current is:

[Specific resistance of the wire, $ \rho = 5 \times {10^{ - 7}}\Omega m $ ]

(A) $ 9m $

(B) $ 6m $

(C) $ 3m $

(D) $ 1.5m $

[Specific resistance of the wire, $ \rho = 5 \times {10^{ - 7}}\Omega m $ ]

(A) $ 9m $

(B) $ 6m $

(C) $ 3m $

(D) $ 1.5m $

The sensitivity of a moving coil galvanometer increases with the decrease in

(A) Number of turns

(B) Area of coil

(C) Magnetic field

(D) Couple per unit twist

(A) Number of turns

(B) Area of coil

(C) Magnetic field

(D) Couple per unit twist

A moving coil galvanometer experiences torque $ki$ where $i$ is the current. If $N$ coils of area $A$ and moment of inertia $I$ are kept in a magnetic field $B$.

(a) Find $k$ in terms of given parameters,

(b) If for current $i$ , the angle of deflection is $\dfrac{\pi }{2}$ , find the torsion constant of spring.

(c) If a charge Q is passed suddenly through the galvanometer find out the maximum angle of deflection.

(a) Find $k$ in terms of given parameters,

(b) If for current $i$ , the angle of deflection is $\dfrac{\pi }{2}$ , find the torsion constant of spring.

(c) If a charge Q is passed suddenly through the galvanometer find out the maximum angle of deflection.

Draw a neat and labelled diagram of a suspended moving coil galvanometer. Also, show that the current through an MCG is directly proportional to the deflection of a coil.

Tangent galvanometer is used to measure:

A) Steady currents

B) Current impulses

C) Magnetic moments of bar magnets

D) Earth's magnetic field

A) Steady currents

B) Current impulses

C) Magnetic moments of bar magnets

D) Earth's magnetic field

A moving coil galvanometer has been fitted with a rectangular coil having $50\;$ turns and dimensions$5\;cm \times 3\;cm$. The radial magnetic field in which the coil is suspended is of $0.05\;Wb/{m^2}$. The torsional constant of the spring is $1.5 \times {10^{ - 9}}\;Nm/{\text{degree}}$. Obtain the current required to be passed through the galvanometer so as to produce a deflection of ${30^0}$.

State the principle of moving coil galvanometer?

In a moving coil galvanometer, a strong horseshoe magnet of concave shaped pole pieces is used?

A) Increase space for rotation.

B) Reduce weight of galvanometer.

C) Protect magnetic fields which are parallel to the plane of coil at any position.

D) Make magnetic induction weak at the centre.

A) Increase space for rotation.

B) Reduce weight of galvanometer.

C) Protect magnetic fields which are parallel to the plane of coil at any position.

D) Make magnetic induction weak at the centre.

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