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JEE Main

IMPORTANT

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A heating element has a resistance of $100 Ω$ at room temperature. When it is connected to a supply of $220 V$ , a steady current of $2 A$ passes in it and temperature is $500^{o} C$ more than the room temperature. The temperature coefficient of resistance of the heating element is

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Important Questions on Current Electricity

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 14 - Current Electricity>JEE Main - 2nd April 2017>Q 112

In the above circuit the current in each resistance is:

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 14 - Current Electricity>JEE Main - 2nd April 2017>Q 113

Which of the following statements is false?

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 14 - Current Electricity>JEE Main - 8th April 2017>Q 114

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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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

A heating element has a resistance of 100 Ω at room temperature. When it is connected to a supply of 220 V, a steady current of 2 A passes in it and temperature is 500 oC more than the room temperature. The temperature coefficient of resistance of the heating element is

Important Questions on Current Electricity

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A heating element has a resistance of $100 Ω$ at room temperature. When it is connected to a supply of $220 V$ , a steady current of $2 A$ passes in it and temperature is $500^{o} C$ more than the room temperature. The temperature coefficient of resistance of the heating element is