Lesson 6.7.2.1
6.7.2.1 Electromagnetism Quiz: AQA Combined Science, Unit 24
20 questions
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Lesson 6.7.2.1, Electromagnetism: 20 multiple choice questions for the AQA GCSE Combined Science (8464), Unit 24: 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
-
What is produced around a conducting wire when a current flows through it?
- Magnetic field
- Electric field
- Sound wave
- Gravitational field
-
What two factors determine the strength of the magnetic field around a wire?
- Voltage and length
- Current and distance
- Resistance and mass
- Current and thickness
-
What effect does shaping a wire into a solenoid have?
- Increases field strength
- Stops current flow
- Decreases resistance
- Removes magnetic field
-
How is the magnetic field inside a solenoid described?
- Strong and uniform
- Random and weak
- Weak and variable
- Zero strength
-
The magnetic field around a solenoid is similar in shape to what object?
- Bar magnet
- Flat disk
- Straight wire
- Circular loop
-
What happens to the magnetic field strength of a solenoid when you add an iron core?
- Disappears
- Decreases
- Increases
- Stays the same
-
What term describes a solenoid with an iron core?
- Resistor
- Transformer
- Electromagnet
- Generator
-
Which action increases the magnetic field strength of an electromagnet?
- Lengthening wires
- Decreasing current
- Removing core
- Increasing current
-
Moving further from a long straight current-carrying wire makes its magnetic field:
- The same
- Reversed
- Weaker
- Stronger
-
Which change increases the magnetic field strength around a straight wire?
- Coiling the wire
- Thicker insulation
- Increasing current
- Decreasing current
-
What shape are the magnetic field lines around a straight current-carrying wire?
- Spirals outwards
- Random dots
- Parallel lines
- Concentric circles
-
How do magnetic field lines run inside the core of a solenoid?
- In outward spirals
- In random directions
- Parallel to axis
- At right angles
-
Why can an electric crane drop scrap metal instantly?
- Poles reverse
- Voltage increases
- Metal melts
- Current switched off
-
(Harder) The current through a wire doubles from 2 A to 4 A at the same distance. The field strength:
- Doubles
- Stays the same
- Halves
- Quadruples
-
(Harder) Compared with an air-cored solenoid with the same current, an iron-cored solenoid has a field that is:
- Weaker
- Unchanged
- Stronger
- Reversed
-
What component is placed inside a solenoid to significantly increase its magnetic field strength?
- Copper core
- Iron core
- Plastic sleeve
- Steel ring
-
What device is commonly used to demonstrate the magnetic effect of a current?
- Voltmeter
- Ammeter
- Gold-leaf electroscope
- Compass needle
-
What is the main benefit of winding a wire into a coil?
- Stops current flowing
- Removes magnetic effects
- Concentrates the field
- Doubles the voltage
-
What happens to an electromagnet's magnetic field when the current is switched off?
- It remains constant
- It reverses
- It disappears
- It doubles
-
(Harder) A compass 1 cm from a wire carrying 5 A deflects strongly. Moving the compass to 2 cm makes the deflection:
- Reversed
- Smaller
- Larger
- The same
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