Lesson 4.7.2.1
4.7.2.1 Electromagnetism Quiz: AQA Physics, Unit 7
20 questions
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Lesson 4.7.2.1, Electromagnetism: 20 multiple choice questions for the AQA GCSE Physics (8463), Unit 7: Magnetism and electromagnetism, written with Revision Ninja.
Host it live on the board and students join with a game code on their own devices, or revise alone with Free Play. The answers are revealed in the game.
The 20 questions
-
When an electric current flows through a conducting wire, what is produced around it?
- An electric charge
- A sound wave
- A gravitational field
- A magnetic field
-
What two factors determine the strength of the magnetic field around a straight wire?
- Time and temperature
- Resistance and mass
- Current and distance
- Voltage and length
-
Why does shaping a wire into a solenoid increase its magnetic field strength?
- Current stops flowing
- Turns add fields
- Resistance decreases
- Voltage doubles
-
What is the nature of the magnetic field inside a solenoid?
- Radial and circular
- Weak and varying
- Zero everywhere
- Strong and uniform
-
What effect does adding an iron core have on a solenoid?
- Increases field strength
- No effect
- Reverses field direction
- Decreases field strength
-
What are the essential components that make up an electromagnet?
- Solenoid with iron core
- Steel rod with switch
- Permanent bar magnet
- Coil of copper wire
-
The magnetic field around a solenoid has a shape similar to which magnet?
- A straight wire only
- A uniform electric field
- A bar magnet
- A point charge
-
What shape is the magnetic field around a straight current-carrying wire?
- Parallel lines
- Concentric circles
- Uniform squares
- Radial lines
-
What happens to the magnetic field strength of a wire if you double the current?
- It stays the same
- It halves
- It doubles
- It quadruples
-
Which device demonstrates the magnetic effect of a current?
- Magnetic compass
- Hydrometer
- Gold-leaf electroscope
- Bourdon gauge
-
Which change increases a coil's magnetic effect?
- Removing iron core
- Decreasing current
- Adding more turns
- Stretching coil out
-
Which device uses an electromagnet to move a switch?
- A solar cell
- A relay
- A torch bulb
- A toaster
-
What determines the direction of a solenoid's magnetic field?
- Core length
- Current direction
- Resistance
- Wire thickness
-
Why does shaping a wire into a solenoid increase its magnetic effect?
- Stops heating
- Reduces resistance
- Shields voltage
- Reinforces field lines
-
What is the result of reversing current direction in a solenoid?
- Core melts
- Field direction reverses
- Field strength halves
- Field becomes zero
-
Which factor does the magnetic field around a straight wire NOT depend on?
- Wire insulation colour
- Presence of conductor
- Distance from wire
- Current magnitude
-
What happens to the magnetic field strength if you increase the turns on a solenoid?
- It decreases
- It drops to zero
- It stays the same
- It increases
-
Why is an iron core added inside a solenoid to form an electromagnet?
- To conduct electricity
- To increase field strength
- To prevent overheating
- To insulate the wire
-
Which device uses a solenoid with an iron core?
- A solar panel array
- A light fitting
- A tea kettle
- An electric bell
-
What describes the magnetic field inside a long solenoid?
- Variable and circular
- Strong and uniform
- Weak and radial
- Zero
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