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Meter bridge works on the principle of

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Important Questions on Current Electricity

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Physics>Electricity and Magnetism>Current Electricity>Meter Bridge

In a meter bridge, the wire of length $1 m$ has a non-uniform cross-section such that, the variation $\frac{d R}{d l}$ of its resistance $R$ with length $l$ is $\frac{d R}{d l} \propto \frac{1}{\sqrt{l}} .$ Two equal resistances are connected as shown in the figure. The galvanometer has zero deflection when the jockey is at point $P .$ What is the length $A P ?$

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EASY

Physics>Electricity and Magnetism>Current Electricity>Meter Bridge

A resistance wire connected in the left gap of a metre bridge balances a

10 Ω

resistance in the right gap at a point which divides the bridge wire in the ratio

3 : 2

. If the length of the resistance wire is

1.5 m

, then the length of

1 Ω

of the resistance wire is:

MEDIUM

Physics>Electricity and Magnetism>Current Electricity>Meter Bridge

In a meter bridge as shown in the figure, it is given that resistance

Y = 12.5 Ω

and that the balance is obtained at a distance

39.5 cm

from end

A

(by jockey

J

). After interchanging the resistances

X

and

Y

a new balance point is found at a distance

l_{2}

from end

A

. What are the values of

X

(in

Ω

) and

l_{2}

MEDIUM

Physics>Electricity and Magnetism>Current Electricity>Meter Bridge

In a meter bridge experiment

S

is a standard resistance.

R

is a resistance wire. It is found that balancing length is

l = 25 c m .

R

is replaced by a wire of half length and half diameter that of

R

of same material, then the balancing distance

l'

(in

c m

) will now be ______________.
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MEDIUM

Physics>Electricity and Magnetism>Current Electricity>Meter Bridge

During an experiment with a metre bridge, the galvanometer shows a null point when the jockey is pressed at $40.0 cm$ using a standard resistance of $90 Ω$ ,as shown in the figure. The least count of the scale used in the metre bridge is $1 mm$ . The unknown resistance is

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EASY

Physics>Electricity and Magnetism>Current Electricity>Meter Bridge

In a meter bridge experiment, the balance point from left is

37.5 cm .

The ratio of the right gap resistance to the left gap resistance is

MEDIUM

Physics>Electricity and Magnetism>Current Electricity>Meter Bridge

Resistance in the two gaps of a meter bridge are

10 Ω

and

30 Ω

, respectively. If the resistances are inter changed, the balance point shifts by

EASY

Physics>Electricity and Magnetism>Current Electricity>Meter Bridge

A potentiometer wire is

100 cm

long and a constant potential difference is maintained across it. Two cells are connected in series first to support one another and then in opposite direction. The balance points are obtained at

50 cm

and

10 cm

from the positive end of the wire in the two cases. The ratio of EMF's is :

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Physics>Electricity and Magnetism>Current Electricity>Meter Bridge

In a meter bridge experiment, the circuit diagram and the corresponding observation table are shown in figure.
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S. No.	$R (Ω)$	$l (c m)$
_1. _2. _3. _4.	$1000$ $100$ $10$ $1$	$60$ $13$ $1.5$ $1.0$

Which of the reading is inconsistent?

EASY

Physics>Electricity and Magnetism>Current Electricity>Meter Bridge

The resistance in the two arms of the meter bridge are

5 Ω

and

R Ω,

respectively. When the resistance

R

is shunted with an equal resistance, the new balance point is at

1.6 l_{1} .

The resistance ‘

R

’ is:

MEDIUM

Physics>Electricity and Magnetism>Current Electricity>Meter Bridge

In meter bridge experiment, to minimize an error due to contact resistance,

MEDIUM

Physics>Electricity and Magnetism>Current Electricity>Meter Bridge

In a meter bridge experiment resistances are connected as shown in the figure. Initially resistance

P = 4 Ω

and the neutral point

N

is at

60 cm

from

A

. Now an unknown resistance

R

is connected in series to

P

and the new position of the neutral point is at

80 cm

from

A

. The value of unknown resistance

R

is -

HARD

Physics>Electricity and Magnetism>Current Electricity>Meter Bridge

Two resistances

X

and

Y

in teh two gaps of a meter-bridge gives a null point dividing the wire in the ratio

2 : 3

. If each resistance is increased by

30 Ω

, the null point divides the wire in the ratio

5 : 6

, calculate the value of

X

and

Y

EASY

Physics>Electricity and Magnetism>Current Electricity>Meter Bridge

In the given arrangement of experiment on metre bridge, if $A D$ corresponding to null deflection of the galvanometer is $X$ , what would be its value if the radius of the wire $A B$ is doubled?

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MEDIUM

Physics>Electricity and Magnetism>Current Electricity>Meter Bridge

Explain with a neat circuit diagram how will you determine unknown resistance ‘X’ by using a meter bridge.

EASY

Physics>Electricity and Magnetism>Current Electricity>Meter Bridge

A potentiometer is an accurate and versatile device to make electrical measurements of E.M.F, because the method involves:

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Physics>Electricity and Magnetism>Current Electricity>Meter Bridge

An ideal battery of emf

4 V

and resistance

R

are connected in series in the primary circuit of a potentiometer of length

1 m

and resistance

5 Ω .

The value of

R,

to give a potential difference of

5 m V

across

10 c m

of potentiometer wire, is:

MEDIUM

Physics>Electricity and Magnetism>Current Electricity>Meter Bridge

With a resistance of

X

in the left gap and a resistance of

9 Ω

in the right gap of meter bridge, the balance point is obtained at

40 cm

from the left end. In what way and to which resistance

3 Ω

resistance be connected to obtained the balance at

50 cm

from the left end?

MEDIUM

Physics>Electricity and Magnetism>Current Electricity>Meter Bridge

On interchanging the resistances, the balance point of a meter bridge shifts to the left by

10 cm

. The resistance of their series combination is

1 kΩ

. How much was the resistance on the left slot before interchanging the resistances?

HARD

Physics>Electricity and Magnetism>Current Electricity>Meter Bridge

Two unknown resistances are connected in two gaps of a meter-bridge. The null point is obtained at

40 cm

from left end. A

30 Ω

resistance is connected in series with the smaller of the two resistances, the null point shifts by

20 cm

to the right end. The value of smaller resistance in

Ω

Meter bridge works on the principle of

Important Questions on Current Electricity

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