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JEE Main

IMPORTANT

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A $9 V$ battery with an internal resistance of $0.5 Ω$ is connected across an infinite network, as shown in the figure. All ammeters $A_{1}, A_{2}, A_{3}$ and voltmeter $V$ are ideal.
Choose the correct statement.

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Important Questions on Current Electricity

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 14 - Current Electricity>JEE Main - 8th April 2017>Q 115

A potentiometer

P Q

is set up to compare two resistances, as shown in the figure. The ammeter

A

in the circuit reads

1.0 A

when the two-way key

K_{3}

is open. The balance point is at a length

l_{1} cm

from

P

when the two-way key

K_{3}

is plugged in between

2 and 1

, while the balance point is at a length

l_{2} cm

from

P

when the key

K_{3}

is plugged in between

3 and 1

. The ratio of two resistances

\frac{R_{1}}{R_{2}},

is found to be
Question Image

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 14 - Current Electricity>JEE Main - 9th April 2017>Q 116

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 -

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 14 - Current Electricity>JEE Main - 9th April 2017>Q 117

A uniform wire of length

l

and radius

r

has a resistance of

100 Ω

. It is recast into a wire of radius

\frac{r}{2}

. The resistance of new wire will be-

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 14 - Current Electricity>JEE Main - 9th April 2017>Q 118

The figure shows three circuits

I, I I

and

I I I

which are connected to a

3 V

battery. If the powers dissipated by the configurations

I, I I

and

I I I

are

P_{1}, P_{2}

and

P_{3}

respectively, then -

Question Image

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 14 - Current Electricity>JEE Main - 9th April 2016>Q 119

In the circuit shown, the resistance r is a variable resistance. If for

r = f R

, the heat generation in r is maximum then the value of

f

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 14 - Current Electricity>JEE Main - 9th April 2016>Q 120

To know the resistance

G

of a galvanometer by half deflection method, a battery of emf

V_{E}

and resistance

R

is used to deflect the galvanometer by angle

θ

. If a shunt of resistance

S

is needed to get half deflection the

G

R

and

S

are related by the equation:

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 14 - Current Electricity>JEE Main - 3rd April 2016>Q 121

The temperature dependence of resistance of

Cu

and undoped

Si

in the temperature range

300 - 400 K

is best described by

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 14 - Current Electricity>JEE Main - 3rd April 2016>Q 122

A galvanometer having a coil resistance of

100 Ω

gives a full scale deflection, when a current of

1 mA

is passed through it. The value of the resistance, which can convert this galvanometer into ammeter giving a full scale deflection for a current of

10 A

, is:

A 9 V battery with an internal resistance of 0.5 Ω is connected across an infinite network, as shown in the figure. All ammeters A1, A2, A3 and voltmeter V are ideal. Choose the correct statement.

Important Questions on Current Electricity

Learn and Prepare for any exam you want !

A $9 V$ battery with an internal resistance of $0.5 Ω$ is connected across an infinite network, as shown in the figure. All ammeters $A_{1}, A_{2}, A_{3}$ and voltmeter $V$ are ideal.
Choose the correct statement.