1. Motion, forces and energy

1.1 Physical quantities and measurement techniques

1.2 Motion

1.3 Mass and weight

1.4 Density

1.5.1 Effects of forces

1.5.2 Turning effect of forces

1.5.3 Centre of gravity

1.6 Momentum

1.7.1 Energy

1.7.2 Work

1.7.3 Energy resources

1.7.4 Power

1.8 Pressure

2. Thermal physics

2.1.1 States of matter

2.1.2 Particle model

2.1.3 Gases and the absolute scale of temperature

2.2.1 Thermal expansion of solids, liquids and gases

2.2.2 Specific heat capacity

2.2.3 Melting, boiling and evaporation

2.3.1 Conduction

2.3.2 Convection

2.3.3 Radiation

2.3.4 Consequences of thermal energy transfer

3. Waves

3.1 General properties of waves

3.2.1 Reflection of light

3.2.2 Refraction of light

3.2.3 Thin lenses

3.2.4 Dispersion of light

3.3 Electromagnetic spectrum

3.4 Sound

4. Electricity and magnetism

4.1 Simple phenomena of magnetism

4.2.1 Electric charge

4.2.2 Electric current

4.2.3 Electromotive force and potential difference

4.2.4 Resistance

4.2.5 Electrical energy and electrical power

4.3.1 Circuit diagrams and circuit components

4.3.2 Series and parallel circuits

4.3.3 Action and use of circuit components

4.4 Electrical safety

4.5.1 Electromagnetic induction

4.5.2 The a.c. generator

4.5.3 Magnetic effect of a current

4.5.4 Force on a current-carrying conductor

4.5.5 The d.c. motor

4.5.6 The transformer

5. Nuclear physics

5.1.1 The atom

5.1.2 The nucleus

5.2.1 Detection of radioactivity

5.2.2 The three types of nuclear emission

5.2.3 Radioactive decay

5.2.4 Half-life

5.2.5 Safety precautions

6. Space physics

6.1.1 The Earth

6.1.2 The Solar System

6.2.1 The Sun as a star

6.2.2 Stars

6.2.3 The Universe

IGCSE Physics 4.5.4 Force on a current-carrying conductor Question Bank

[Maximum number: 4]

Fig. 7.1 shows a small plotting compass which is aligned with the magnetic field between magnetic poles A and B of a U-shaped magnet.

Fig. 7.1

(a)

Fig. 7.2 shows a wire, placed between two poles, carrying a current in the direction of the arrow.

Fig. 7.2

On Fig. 7.2, draw an arrow to show the direction of the force on the wire due to the magnetic field.

[ 2 ]

(b)

Fig. 7.3 shows a $\beta$ -particle moving in the direction of the arrow between the same two poles.

Fig. 7.3

On Fig. 7.3, draw an arrow to show the direction of the force on the $\beta$ -particle due to the magnetic field.
[Total: 5]

[ 2 ]

[Maximum number: 1]

The diagram shows a wire hanging freely between the poles of a magnet. There is a current in the wire in the direction shown.

The magnet and current cause a force to act on the wire.
In which direction does this force act?

into the page (away from you)

out of the page (toward you)

to the left

to the right

[Maximum number: 1]

A conducting wire is placed between the poles of a magnet. When an electric current in the wire is in the direction shown, then the force on the wire acts out of the page.

Three statements of different conditions and how the wire is affected are given.
1 When the current is towards the top of the page and the direction of the magnetic field is unchanged, the force produced acts into the page.

2 When the current is towards the bottom of the page and the magnetic field is reversed, the force produced acts into the page.

3 When the current in the wire is alternating, the wire vibrates into and out of the page.
Which statements are correct?

1, 2 and 3

1 and 2 only

1 and 3 only

2 and 3 only

[Maximum number: 1]

An electron moves into a uniform magnetic field.
The arrow shows the initial direction of motion of the electron.
The direction of the magnetic field is into the plane of the page.

In which direction does a force act on the electron when it enters the magnetic field?

into the page

out of the page

towards the bottom of the page

towards the top of the page

[Maximum number: 1]

A metal rod PQ rests on two horizontal metal wires that are attached to a battery. The rod lies between the poles of a magnet.

When the switch is closed, the rod moves to the right.
What could be changed so that the rod moves to the left?

Open the switch.

Reverse the battery terminals and exchange the poles of the magnet.

Reverse the battery terminals but without exchanging the poles of the magnet.

Turn the metal rod around (P and Q exchanged).

[Maximum number: 1]

The diagram shows a wire in the magnetic field between two poles of a magnet.

The current in the wire repeatedly changes between a constant value in one direction and a constant value in the opposite direction, as shown in the graph.

What is the effect on the wire?

The force on the wire alternates between one direction and the opposite direction.

The force on the wire is constant in size and direction.

There is no force acting on the wire at any time.

There is only a force on the wire when the current reverses.

[Maximum number: 1]

A current passes along a wire placed between the poles of a permanent magnet.
The wire experiences a force due to the magnetic field.

What will change the direction of this force?

increasing the current

reversing the current

increasing the strength of the magnetic field

using an electromagnet with the same polarity as the permanent magnet

(a)

An electron source produces a narrow beam of electrons that all travel at the same speed.

The electron source is placed in a vacuum and the beam of electrons travels vertically downwards. Fig. 7.1 shows the beam of electrons before it passes between the N -pole and the S-pole of a magnet.

Fig. 7.1

[ 3 ]

(i)

Describe and explain what happens to the beam of electrons in the magnetic field between the poles of the magnet in Fig. 7.1.

[ 3 ]

[Maximum number: 1]

An electron moves into a uniform magnetic field.
The arrow shows the initial direction of motion of the electron.
The direction of the magnetic field is into the plane of the page (away from you).

In which direction does a force act on the electron when it enters the magnetic field?

into the page

out of the page

towards the bottom of the page

towards the top of the page

[Maximum number: 1]

The diagram shows a current-carrying conductor in a magnetic field.
Which arrow shows the direction of the force acting on the conductor?

0 selected

Question 7

Question 7(b)

Question 7(c)

Question 30

Question 30

Question 31

Question 32

Question 32

Question 32

Question 7

Question 7(b)

Question 7(b)(ii)

Question 35

Question 35