The range of an ammeter of resistance G can be increased from I to n I by connecting

A series resistance of G n + 1 Ω

A series resistance of G n - 1 Ω

MEDIUM

Earn 100

A galvanometer of resistance $G Ω$ is shunted with $S Ω$ . The effective resistance of the combination is $R_{a}$ . Then which of the following statements is true

50% studentsanswered this correctly

Important Questions on Magnetic Fields due to Electric Current

MEDIUM

Physics>Electricity and Magnetism>Magnetic Fields due to Electric Current>Ammeter

A galvanometer of resistance

100 Ω

requires

10 μA

current for full scale deflection. Now a resistance of

1 Ω

is connected to convert it into an ammeter. The minimum current required to obtain full scale deflection is

MEDIUM

Physics>Electricity and Magnetism>Magnetic Fields due to Electric Current>Ammeter

The range of an ammeter of resistance

G

can be increased from

I

n I

by connecting

EASY

Physics>Electricity and Magnetism>Magnetic Fields due to Electric Current>Ammeter

An ammeter of resistance

1.5 Ω

can measure currents upto

1 A

. The value of shunt resistance to measure current upto

4 A

EASY

Physics>Electricity and Magnetism>Magnetic Fields due to Electric Current>Ammeter

This question has

Statement I

and

Statement II

. Of the four choices given after the Statements, choose the one that best describes the two Statements.

Statement - I :

Higher the range, greater is the resistance of ammeter.

Statement - II :

To increase the range of ammeter, additional shunt needs to be used across it.

EASY

Physics>Electricity and Magnetism>Magnetic Fields due to Electric Current>Ammeter

A circuit contains an ammeter, a battery of 30 v and a resistance 40.8 ohm all connected in series. If the ammeter has coil of resistance 480 ohm and a shunt of 20 ohm, the reading in the ammeter will be:

EASY

Physics>Electricity and Magnetism>Magnetic Fields due to Electric Current>Ammeter

50 ohm

galvanometer gets full scale deflection when a current of

0.01 A

pass through the coil. When it is converted to a

10 A

ammeter, the shunt resistance is

EASY

Physics>Electricity and Magnetism>Magnetic Fields due to Electric Current>Ammeter

The deflection in galvanometer falls to $\left(\frac{1}{4}\right)^{\operatorname{th}}$ when it is shunted by $3 Ω$ . If additional shunt of $2 Ω$ is connected to earlier shunt, the deflection in galvanometer falls to

EASY

Physics>Electricity and Magnetism>Magnetic Fields due to Electric Current>Ammeter

An ammeter reads up to

1 A

. Its internal resistance is

0.45 Ω

. To increase the range to

10 A

the value of the required shunt is

MEDIUM

Physics>Electricity and Magnetism>Magnetic Fields due to Electric Current>Ammeter

50 Ω

resistance is connected to a battery of

5 V

. A galvanometer of resistance

100 Ω

is to be used as an ammeter to measure current through the resistance, for this a resistance

r_{S}

is connected to the galvanometer. Which of the following connections should be employed if the measured current is with in

1 %

of the current without the ammeter in the circuit?

HARD

Physics>Electricity and Magnetism>Magnetic Fields due to Electric Current>Ammeter

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_{o} (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,

MEDIUM

Physics>Electricity and Magnetism>Magnetic Fields due to Electric Current>Ammeter

The deflection in the galvanometer falls to

{(\frac{1}{5})}^{th}

when

4 Ω

resistance is connected in parallel with it. What will be the deflection if an additional resistance of

2 Ω

is connected in parallel with the above shunted galvanometer?

EASY

Physics>Electricity and Magnetism>Magnetic Fields due to Electric Current>Ammeter

A galvanometer with its coil resistance

25 Ω

requires a current of

1 mA

for its full deflection. In order to construct an ammeter to read up to a current of

2 A

the approximate value of the shunt resistance should be:

MEDIUM

Physics>Electricity and Magnetism>Magnetic Fields due to Electric Current>Ammeter

How do you convert a moving coil galvanometer into an ammeter?

EASY

Physics>Electricity and Magnetism>Magnetic Fields due to Electric Current>Ammeter

A galvanometer having a resistance of

8 Ω

is shunted by a wire of resistance

2 Ω .

If the total current is

1 A,

the part of it passing through the shunt will be

MEDIUM

Physics>Electricity and Magnetism>Magnetic Fields due to Electric Current>Ammeter

Distinguish between ammeter and voltmeter.

MEDIUM

Physics>Electricity and Magnetism>Magnetic Fields due to Electric Current>Ammeter

Consider a galvanometer shunted with

5 Ω

resistance and

2 %

of current passes through it. What is the resistance of the given galvanometer?

EASY

Physics>Electricity and Magnetism>Magnetic Fields due to Electric Current>Ammeter

A galvanometer has a coil of resistance

5 Ω

and requires

15 mA

for full-scale deflection. The shunt resistance needed to convert the galvanometer into an ammeter of the range

0 - 1 A

MEDIUM

Physics>Electricity and Magnetism>Magnetic Fields due to Electric Current>Ammeter

In an ammeter

0.2 %

of main current passes through the galvanometer. If resistance of galvanometer is

G,

the resistance of ammeter will be:

MEDIUM

Physics>Electricity and Magnetism>Magnetic Fields due to Electric Current>Ammeter

A galvanometer has a 50 division scale. Battery has no internal resistance. It is found that there is deflection of 40 divisions when $R.B. = 2400 Ω .$ Deflection becomes 20 divisions when resistance taken from resistance box is 4900 Ω. Then we can conclude :

Question Image

Note: This question is awarded as the bonus. Now the question is corrected.

HARD

Physics>Electricity and Magnetism>Magnetic Fields due to Electric Current>Ammeter

In a circuit for finding the resistance of a galvanometer by half deflection method, a

6 V

battery and a high resistance of

11 kΩ

are used. The figure of merit of the galvanometer is

60 μA {division}^{- 1}

. In the absence of shunt resistance, the galvanometer produces a deflection of

θ = 9

divisions when current flows in the circuit. The value of the shunt resistance that can cause the deflection of

\frac{θ}{2}

, is closest to:

A galvanometer of resistance G Ω is shunted with S Ω. The effective resistance of the combination is Ra. Then which of the following statements is true

Important Questions on Magnetic Fields due to Electric Current

Learn and Prepare for any exam you want !

A galvanometer of resistance $G Ω$ is shunted with $S Ω$ . The effective resistance of the combination is $R_{a}$ . Then which of the following statements is true