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 4.5.1 Electromagnetic induction Question Bank

[Maximum number: 1]

When a conductor in a complete circuit cuts across a magnetic field, a current is induced in the conductor.

Which statement about the induced current is correct?

The induced current is in the same direction as the motion of the conductor.

The induced current is in the opposite direction to the motion of the conductor.

The direction of the induced current is in the same direction as the magnetic field.

The direction of the induced current opposes the change causing it.

[Maximum number: 1]

A wire is moved down in a direction perpendicular to the magnetic field.

Three changes are suggested.
1 The speed of the movement of the wire is increased.
2 The magnetic field strength is decreased.
3 The direction of the magnetic field is reversed.
Which changes increase the electromotive force (e.m.f.) induced in the wire?

1 and 3

1 only

2 and 3

3 only

[Maximum number: 1]

A wire is moved across a magnetic field. This causes an induced current in the wire. The induced current interacts with the magnetic field to produce a force on the wire. In which direction is this force?

in the direction of the current

in the direction of movement of the wire

in the opposite direction to the current

in the opposite direction to the movement of the wire

[Maximum number: 1]

A piece of soft iron XY has a coil of wire wound round it.

The N pole of a bar magnet is pulled away from end X which causes an induced current in the coil.

The magnet is now turned round so that the N pole is on the left. It is taken to the other end of the soft iron and the N pole is pushed towards end Y . A new current is induced in the coil.

Which statement is correct?

The new induced current is in the opposite direction and causes the soft iron to attract the N pole.

The new induced current is in the opposite direction and causes the soft iron to repel the N pole.

The new induced current is in the same direction and causes the soft iron to attract the N pole.

The new induced current is in the same direction and causes the soft iron to repel the N pole.

(a)

Fig. 7.1 shows a coil of wire wound on a thin plastic cylinder. The plastic has no effect on any magnetic field. The galvanometer is extremely sensitive.

Fig. 7.1

A magnet is fixed to a small trolley that runs without friction on a track through the cylinder and coil.

[ 4 ]

(i)

The trolley is released from point A so it runs through the coil from right to left.

State and explain what is observed on the galvanometer.

[ 2 ]

(ii)

The trolley is now released from point B so it runs through the coil from right to left again.

State what is observed on the galvanometer and explain why it is different to your answer in (a)(i).

[ 2 ]

[Maximum number: 6]

Fig. 7.1 shows a horizontal conducting wire XY between two opposite magnetic poles. Wire XY forms a circuit with an ammeter.

Fig. 7.1

(a)

Explain why the reading on the ammeter is zero when the wire XY is not moving.

[ 1 ]

(b)

The wire XY is moved and there is a deflection on the ammeter that indicates there is a current in the wire from X to Y.

On Table 7.1, tick one box to indicate the direction of the movement of the wire XY and explain your answer.

Table 7.1

explanation

[ 3 ]

(c)

State what is observed on the ammeter when the wire XY is moved

[ 2 ]

(i)

in the opposite direction to part (b)

[ 1 ]

(ii)

in the same direction as part (b) but at a greater speed

[ 1 ]

[Maximum number: 1]

The diagram shows a wire between the poles of a magnet.
The wire is perpendicular to the page.

The wire is moved and a current is induced upwards, out of the paper.
In which direction is the wire moved?

left to right

right to left

up the page

down the page

[Maximum number: 1]

A solenoid is connected to a very sensitive ammeter. A rod is inserted into one end of the solenoid. The ammeter shows that there is a small electric current in the solenoid while the rod is moving.

Which rod is being inserted?

a heated copper rod

a magnetised steel rod

an uncharged nylon rod

a radioactive uranium rod

[Maximum number: 1]

A solenoid is connected to a very sensitive ammeter. A rod is inserted into one end of the solenoid. The ammeter shows that there is a small electric current in the solenoid while the rod is moving.

Which rod is being inserted?

a heated copper rod

a magnetised steel rod

an uncharged nylon rod

a radioactive uranium rod

[Maximum number: 1]

The diagram shows a bar magnet and a coil of wire. The bar magnet is moved at the same speed in each experiment.

In which situation is the largest electromotive force (e.m.f.) induced?