Can Moving Coil Galvanometer detect AC? why?

No, average current is zero for AC

Yes, deflection is proportional to current

What is the principle of galvanometer?

Torque acts on a current carrying coil suspended in the uniform magnetic field, In radial magnetic field, deflection of coil is proportional to current

The current sensitivity of Moving Coil Galvanometer increases by:

Increasing the area of the coil

Increasing the magnetic induction

Decreasing the couple per unit twist of the suspension fibre.

Torque acts on a current carrying coil suspended in the uniform magnetic field

What is the use of radial magnetic in galvanometer?

allow maximum magnetic flux through the coil

it gains maximum torque due to magnetic field

makes the deflection proportional to current

torque becomes independent of the angle of deflection

Arrange the following in the ascending order of resistance: Ammeter, micro ammeter, milli ammeter, galvanometer

Ammeter, milli ammeter, micro Ammeter, galvanometer.

Ammeter, micro ammeter, milli ammeter, galvanometer

micro ammeter, milli ammeter, galvanometer, Ammeter

galvanometer, Ammeter, micro ammeter, milli ammeter

Arrange the following in the ascending order of resistance: Voltmeter, micro voltmeter, milli voltmeter, galvanometer

galvanometer, micro voltmeter, milli voltmeter, Voltmeter

Voltmeter, micro voltmeter, milli voltmeter, galvanometer

micro ammeter, milli ammeter, galvanometer, Ammeter

micro ammeter, milli ammeter, Ammeter, galvanometer,

How to increase the voltage sensitivity of a galvanometer?

increasing the area of the coil

using spring of low couple per unit twist

increasing the magnetic induction

Name the material used for the construction of spring in a MCG and why?

phosphor bronze, low torsional constant

phosphor bronze, large torsional constant

ASSERTION(A): Current sensitivity of moving coil galvanometer can be increased by increasing the number of turns of the coil of the galvanometer. REASON (R): The current sensitivity of a moving coil galvanometer is directly proportional to number of turns of the coil of the galvanometer.

A & R are true and R is the correct explanation for A

A & R are true but R is not the correct explanation for A

ASSERTION(A): Voltage sensitivity of moving coil galvanometer can be increased by increasing the number of turns of the coil of the galvanometer. REASON (R): The voltage sensitivity of a moving coil galvanometer is directly proportional to number of turns of the coil of the galvanometer.

A & R are true and R is the correct explanation for A

A & R are true but R is not the correct explanation for A

ASSERTION(A): A galvanometer cannot be directly used to measure large values of current. REASON (R): The galvanometer is highly sensitive and has a finite resistance.

A & R are true and R is the correct explanation for A

A & R are true but R is not the correct explanation for A

ASSERTION(A): If a voltmeter is connected parallel to a resistor in a closed circuit the potential recorded.by the voltmeter is less than the p. d. across the resistor before connecting the voltmeter. REASON (R): The total resistance of the circuit increases due to the introduction of the voltmeter .

A & R are true and R is the correct explanation for A

A & R are true but R is not the correct explanation for A

The expression for shunt resistance(S) used to convert a galvanometer of resistance (G) showing full scale deflection for a current of I g to an ammeter of maximum range I is ......

( I g × G ) I − I g \frac{\left(I_g\times G\right)}{I-I_g} I − I g ( I g × G )

( I − I g ) I g × G \frac{\left(I\ -\ I_g\right)}{I_g\times G} I g × G ( I − I g )

I g G I g − I \frac{I_gG}{Ig\ -\ I} I g − I I g G

( I × G ) I − I g \frac{\left(I\times G\right)}{I\ -\ Ig} I − I g ( I × G )

The current sensitivity of a galvanometer is

B A N C G \frac{BAN}{C\ G} C G B A N

= V o l t a g e s e n s i t i v i t y G =\frac{Voltage\ sensitivity}{G}\ = G V o l t a g e s e n s i t i v i t y

C G B A N \frac{CG}{BAN} B A N C G

The voltage sensitivity of a galvanometer is

B A N C G \frac{BAN}{C\ G} C G B A N

= C u r r e n t s e n s i t i v i t y G =\frac{Current\ sensitivity}{G}\ = G C u r r e n t s e n s i t i v i t y

C G B A N \frac{CG}{BAN} B A N C G

The expression for shunt resistance(S) used to convert a galvanometer of resistance (G) showing full scale deflection for a current of I g to an voltmeter of maximum range V is ......

R = V I g − G R\ =\frac{V}{I_g}-G R = I g V − G

R = G − V I g R\ =G\ -\ \frac{V}{I_g} R = G − I g V

R = I g V − G R\ =\ \frac{I_g}{V}-G R = V I g − G

R = G − I g V R\ =\ G\ -\ \frac{I_g}{V} R = G − V I g

A moving coil galvanometer uses concave cylindrical magnetic poles, because

It provides radial magnetic field

The effective component of magnetic field is always normal to the area vector of the coil

The galvanometer can use a linear scale for measurement

angle dependence of torque can be avoided

MOVING COIL GALVANOMETER 10012019

Quiz

•

Physics

•

12th Grade

•

Practice Problem

•

Medium

Shani Chandran

Used 32+ times

FREE Resource

30 questions

Show all answers

1.

MULTIPLE SELECT QUESTION

30 sec • 1 pt

What is the function of a galvanometer?

Detects the presence of current in a circuit

Shows the direction of current in a circuit

Can measure small current

Can measure small potential difference

Can measure resistance of the circuit

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Current sensitivity is ............

Deflection produced by unit current

Current needed to produce unit deflection

Current needed to produce full scale deflection in galvanometer

Voltage needed to produce full scale deflection

Voltage needed to produce unit deflection

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What are the resistances of ideal voltmeter and ammeter?

zero, infinity

infinity, zero

very high , very low

very low , very high

infinity, infinity

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How can a galvanometer be converted to a voltmeter?

Connecting a high resistance in parallel to galvanometer

Connecting a low resistance in series of galvanometer

Connecting a high resistance in series of galvanometer

Connecting a low resistance in parallel to galvanometer

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How can a galvanometer be converted to an ammeter?

connecting a low resistance in series to galvanometer

connecting a high resistance in series to galvanometer

connecting a low resistance in parallel to galvanometer

connecting a high resistance in parallel to galvanometer

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How can you increase the range of voltmeter?

By increasing the resistance connected to the galvanometer

By decreasing the resistance connected to the galvanometer

Can't change the range

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Can you change a voltmeter in to an ammeter?

No

Yes

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MOVING COIL GALVANOMETER 10012019

30 questions

What is the function of a galvanometer?

Current sensitivity is ............

What are the resistances of ideal voltmeter and ammeter?

How can a galvanometer be converted to a voltmeter?

How can a galvanometer be converted to an ammeter?

How can you increase the range of voltmeter?

Can you change a voltmeter in to an ammeter?

Can you change an ammeter in to a voltmeter?

Can Moving Coil Galvanometer detect AC? why?

How are the voltmeter and ammeter connected in circuit?

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