#### Chapters

Chapter 2: Motion in One Dimension

Chapter 3: Laws of Motion

Chapter 4: Pressure in Fluids

Chapter 5: Upthrust and Archimedes’ Principle

Chapter 6: Heat and Energy

Chapter 7: Energy Flow and Practices for Conservation of Resources

Chapter 8: Light

Chapter 9: Sound

Chapter 10: Electricity and Magnetism – 1

Chapter 11: Electricity and Magnetism – 2

## Chapter 10: Electricity and Magnetism – 1

#### Unit I Exercise 1

### Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 Chapter 10 Electricity and Magnetism – 1 Unit I Exercise 1

There is a positively charged sphere A and negatively charged sphere B, such that they are brought in electrical contact by a copper wire.

Which sphere is at higher potential before electrical contact on the basis of convention?

There is a positively charged sphere A and negatively charged sphere B, such that they are brought in electrical contact by a copper wire.

Which sphere is at lower potential before electrical contact on the basis of convention?

There is a positively charged sphere A and negatively charged sphere B, such that they are brought in electrical contact by a copper wire.

In which direction conventional current flows?

In which direction electronic current flows?

What is the potential of the spheres after electrical contact?

What do you understand by the term electric potential?

Define electric potential in terms of energy spent.

State the unit of electric potential and define it.

What do you understand by the term quantity of electric charge?

State SI unit of electric charge and define it.

How many electrons constitute one unit electric charge in SI system?

What do you understand by the term electric current?

State and define the SI unit of electric current.

State the relation between electric current; the number of electrons moving in a circuit and time in seconds.

How electric current flows in solids?

How electric current flows in liquids?

Define the term potential difference?

How is potential difference related to work done and quantity of charge?

#### Unit I Practice Problems 1

### Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 Chapter 10 Electricity and Magnetism – 1 Unit I Practice Problems 1

A charge of 5000 C flows through an electric circuit in 2 hours and 30 minutes. Calculate the magnitude of current in a circuit.

A charge of 8860 C flows through an electric circuit in 2 min and 40 s. Calculate the magnitude of current in a circuit.

#### Unit I Practice Problems 2

### Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 Chapter 10 Electricity and Magnetism – 1 Unit I Practice Problems 2

A battery can supply a charge of 25 × 10^{4} C. If the current is drawn from battery at the rate of 2.5 A, calculate the time in which battery will discharge completely.

A dry cell can supply a charge of 800 C. If continuous current of 8.0 mA is drawn, calculate the time in which cells will discharge completely.

#### Unit I Practice Problems 3

### Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 Chapter 10 Electricity and Magnetism – 1 Unit I Practice Problems 3

Calculate the total number of electrons flowing through a circuit in 20 mins and 40 s, if a current of 40 μA flows through the circuit.

[1 e^{–} = 1.6 × 10^{-19 }C]

4 × 10^{20} electrons flow through a circuit in 10 hours. Calculate magnitude of current. [1 e- = 1.6 × 10^{-19} C]

#### Unit I Practice Problems 4

### Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 Chapter 10 Electricity and Magnetism – 1 Unit I Practice Problems 4

What is the electrical potential at a point in an electric field when 24 J of work is done in moving a charge of 96 C from infinity?

A charge of 75 C is brought from infinity to a given point in an electric field, when amount of work done is 3.75 J. Calculate the electrical potential at that point.

#### Unit I Practice Problems 5

### Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 Chapter 10 Electricity and Magnetism – 1 Unit I Practice Problems 5

A work of 25 J and 30 J is done when 5 C charge is moved first to point A and then to point B from infinity. Calculate the potential difference between points A and B.

A charge of 25 C is moved from infinity to points A and B in an electric field when the work is done to do so is 10 J and 10.5 J respectively. Calculate the potential difference between points A and B.

#### Unit II Exercise 2 (A) Objective Questions

### Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 Chapter 10 Electricity and Magnetism – 1 Unit II Exercise 2 (A) Objective Questions

**Select the correct option:**

SI unit potential difference is:

coulomb

kelvin

volt

ampere

**Select the correct option:**

Current in a circuit flows:

in a direction from high potential to low potential

in a direction from low potential to high potential

in a direction of flow of electron

in any direction

**Select the correct option:**

In a metallic conductor, electric current is thought to be due to movement of:

ions

amperes

electrons

protons

Assuming that the charges of an electron is 1.6 × 10^{-19} coulombs, the number of electrons passing through a section of wire per sec, when the wire carries a current of one ampere is:

0.625 × 10

^{19}1.6 × 10

^{-19}1.6 × 10

^{19}0.627 × 10

^{-17}

**Select the correct option:**

Which of the following is the best conductor of electricity?

copper

gold

platinum

silver

#### Unit II Exercise 2 (B) Subjective Questions

### Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 Chapter 10 Electricity and Magnetism – 1 Unit II Exercise 2 (B) Subjective Questions

What do you understand by the term electric cell?

Draw a neat and labelled diagram of a simple voltaic cell showing clearly the direction of flow of conventional current and direction of flow of electrons.

Briefly describe the theory of simple voltaic cell.

What do you understand by the closed electric circuit

What do you understand by the open electric circuit?

State two conditions necessary for a circuit, such that electric current flows through it.

Draw a neat diagram showing a closed electric circuit.

Draw a neat diagram showing a open electric circuit.

Name four electric conductors and four electric insulators.

What do you understand by the term electric resistance?

Why does the filament of an electric bulb in an electric circuit get white-hot, but not the connecting wires?

Is it correct to say that a resistance wire is an insulator or a bad conductor? Explain your answer.

What do you understand by the term series circuit?

State two characteristics of resistances in the series circuit.

Draw a diagram showing two bulbs connected in series to a dry cell.

What do you understand by the term parallel circuit?

State two characteristics of resistance in the parallel circuit.

Draw a diagram showing two bulbs connected in parallel to a dry cell.

## Chapter 10: Electricity and Magnetism – 1

## Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 chapter 10 - Electricity and Magnetism – 1

Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 chapter 10 (Electricity and Magnetism – 1) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the CISCE Class 9 A New Approach to ICSE Physics Part 1 solutions in a manner that help students grasp basic concepts better and faster.

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Concepts covered in Class 9 A New Approach to ICSE Physics Part 1 chapter 10 Electricity and Magnetism – 1 are Simple Electric Circuit Using an Electric Cell and a Bulb to Introduce the Idea of Current, Insulators and Conductors, Closed and Open Circuits, Direction of Current (Electron Flow and Conventional), Social Initiatives - Improving Efficiency of Existing Technologies and Introducing New Eco-friendly Technologies. Creating Awareness and Building Trends of Sensitive Use of Resources and Products, Induced Magnetism, Magnetic Field of Earth, Neutral Points in Magnetic Fields, Lines of Magnetic Field and Their Properties, Introduction of Electromagnet and Its Uses, Electrical Energy and Power, Concept of Magnetism, Concept of Magnetic and Non-magnetic Substances..

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