How is a galvanometer converted to an ammeter?

As we know that, a galvanometer is a device that is used to detect small electric current flowing in the circuit and an ammeter is an instrument used to measure the current in a circuit. And ammeter is connected in series with the circuit. It is a low resistance instrument. A Galvanometer is converted into an ammeter by connecting a low resistance S of suitable value in parallel with the galvanometer coil. Here, S = G I g I - I g where, G = Resistance of the Galvanometer

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12th Odisha Board

IMPORTANT

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A $50 mV$ voltmeter has a resistance of $5 ohm$ . A multiplier has been inserted to produce a voltmeter range of $3 volt$ How can be multiplier be modified so that the new meter will have a range of $15 V$ .

Important Questions on Magnetic Effect of Electric Current

MEDIUM

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 8 - Magnetic Effect of Electric Current>MODEL QUESTIONS>Q 23

A galvanometer of resistance

12 ohm

gives full scale deflection for a current of

2.5 mA

. How will you convert it into an ammeter of range

7.5 A

. Find the resistance of the ammeter.

HARD

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 8 - Magnetic Effect of Electric Current>MODEL QUESTIONS>Q 24

A portable galvanometer gives full-scale deflection for a current of

1 mA

. With a resistance of

9900 ohm

in series with its coil, it can measure potential difference up to

10 V

. Find the resistance of the galvanometer. How can you convert it into an ammeter of

10 mA

range?

HARD

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 8 - Magnetic Effect of Electric Current>MODEL QUESTIONS>Q 25

A galvanometer of resistance

50 Ω

produces full-scale deflection for a current of

0.15 A

. Determine the value of shunt required to make it an ammeter of range of

1.5 A

and

5 A

HARD

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 8 - Magnetic Effect of Electric Current>MODEL QUESTIONS>Q 25

A galvanometer of resistance

50 Ω

produces full-scale deflection for a current of

0.15 A

. Determine the value of shunt required to make it an ammeter of range of

5 A

HARD

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 8 - Magnetic Effect of Electric Current>MODEL QUESTIONS>Q 26

A uniform magnetic field

\vec{B}

of magnitude

1.2 mT

points vertically upwards through the volume of a laboratory chamber. A proton with Kinetic Energy

5.3 MeV

enters the chamber moving horizontally from south to north. Find the magnetic deflecting force acting on the proton as it enters the chamber. What acceleration is produced in the proton? (proton mass=

1.67 \times 10^{- 27} kg

)

HARD

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 8 - Magnetic Effect of Electric Current>MODEL QUESTIONS>Q 27

A Helmholtz coil consists of two thin flat coaxial coils separated by a distance equal the radius of each coil. Compare the magnetic induction at the centre of each coil with that produced at the midpoint of the axis and show that inside the Helmholtz coil the field is almost uniform.

HARD

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 8 - Magnetic Effect of Electric Current>MODEL QUESTIONS>Q 28

Find the magnetic field at the centre of a square of side

a

carrying current

1 A

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12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 8 - Magnetic Effect of Electric Current>MODEL QUESTIONS>Q 29

A semi-circular of radius

20 cm

carries a current of

10 A

. Calculate the magnetic field at the centre of the arc.

A 50 mV voltmeter has a resistance of 5 ohm. A multiplier has been inserted to produce a voltmeter range of 3 volt How can be multiplier be modified so that the new meter will have a range of 15 V.

Important Questions on Magnetic Effect of Electric Current

Learn and Prepare for any exam you want !

A $50 mV$ voltmeter has a resistance of $5 ohm$ . A multiplier has been inserted to produce a voltmeter range of $3 volt$ How can be multiplier be modified so that the new meter will have a range of $15 V$ .