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WorksheetsExploring Magnetic Effects
Total questions: 20
Worksheet time: 10mins
What is the principle behind electromagnetism?
The principle of electromagnetism is unrelated to magnetic fields.
The principle behind electromagnetism is the interaction between electric charges and magnetic fields.
Electromagnetism only involves static electric charges.
Electromagnetism is solely based on gravitational forces.
How does an electromagnet work?
An electromagnet works by generating a magnetic field through electric current in a wire coil.
An electromagnet generates heat through electric resistance in a wire.
An electromagnet works by using permanent magnets to create a field.
An electromagnet functions by spinning a metal core without any electric current.
What are the main components of an electromagnet?
Wire, magnet, and voltage source.
Coil of wire, core material (usually iron), and electric current.
Magnet, switch, and diode.
Battery, resistor, and capacitor.
What is a permanent magnet?
A magnet that requires electricity to function.
A type of magnet that can only attract certain metals.
A temporary magnet that loses its magnetism quickly.
A permanent magnet is a magnet that maintains its magnetic properties without an external power source.
Name common materials used to make electromagnet magnets.
Copper
Iron
Plastic
Aluminum
What is the difference between an electromagnet and permanent magnet?
They both are temporary magnet
They both are temporary magnet
Electromagnet is temporary while the permanent isn't
They both are natural magnets.
What causes the hammer of an electric bell to strike the gong repeatedly?
Continuous current flow
Alternating current
Rapid making and breaking of the circuit
Manual pressing of the hammer
If the direction of current in a wire is reversed, the direction of magnetic field —
Remains the same
Becomes zero
Becomes stronger
Reverses
Can a permanent magnet lose its magnetism? If so, how?
No, a permanent magnet can only gain magnetism.
No, a permanent magnet never loses its magnetism.
Yes, a permanent magnet can lose its magnetism.
Yes, but only if it is exposed to extreme cold.
What are some applications of electromagnets in everyday life?
Light bulbs
Batteries
Solar panels
Applications of electromagnets include electric motors, magnetic locks, MRI machines, speakers, cranes, and relays.
An electromagnet works only when —
The core is made of copper
Electric current flows through the coil
The coil is magnetized permanently
The switch is off
What is the Earth's magnetic field and how does it affect us?
The Earth's magnetic field is a protective force generated by its molten core, affecting navigation, animal migration, and shielding us from solar radiation.
The magnetic field is a solid layer surrounding the Earth.
It has no impact on animal behavior or navigation.
The Earth's magnetic field is caused by the sun's rays.
Which energy conversion takes place in an electric bell?
Sound → Electrical
Electrical → Sound
Mechanical → Electrical
Magnetic → Heat
Which of the following parts of an electric bell acts as an electromagnet?
Armature
Hammer
Soft iron core
Gong
What happens if we increase the number of turns in solenoid
It increases it's heating effect
It increases it's magnetic strength
It breaks the coil
It does nothing
Why is a permanent magnet not used in electric bell?
It will damage the bell
It will run the bell less efficiently
It can't be turned on or off
It will cause damage to our ears
How an electroamgent can be made stronger?
By hammering
By heating
By decreasing the number of turns
By increasing the amount of current
In an electric bell, the function of the hammer is to —
Attract the armature
Hit the gong to produce sound
Convert electrical energy into heat energy
Make and break the circuit
What is a solenoid?
A electromagnet
A wire
A cylindrical coil of wire having turns
An electric bell
Who discovered magnetic effect of electric current?
Albert Einstein
Galileo Galilei
Hans Christian Oersted
Alexander Fleming
