ELECTROMAGNETISM MODULE1
Quiz by Daryl Cadanilla
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- Q1
When a magnet is suspended and free to rotate, where does its north pole point?
Towards the Earth's magnetic north pole
Towards the Earth's magnetic south pole
Towards the geographic south pole
Towards the geographic north pole
30s - Q2
How does electromagnetic induction occur?
When a changing magnetic field passes through a wire, it induces an electric current in the wire.
When a magnet moves near a wire, it generates an electric current in the wire.
When an electric current passes through a wire, it generates a magnetic field.
When electric charges accumulate on a conductor, they create a magnetic field.
30s - Q3
Which device converts electrical energy into mechanical energy?
Electric generator
Induction coil
Electric motor
Transformer
30s - Q4
What is the basic principle behind the operation of an electric motor?
Electromagnetic induction
Electromagnetic radiation
Electric resistance
Magnetic repulsion
30s - Q5
What is the main difference between an AC generator and a DC generator?
AC generators operate on batteries, while DC generators operate on external power sources.
AC generators produce more energy than DC generators.
AC generators produce alternating current, while DC generators produce direct current.
AC generators use a commutator, while DC generators use slip rings.
30s - Q6
The strength of the magnetic field produced by a current-carrying wire depends on:
resistance of the wire
Length of the wire
Voltage across the wire
Current flowing through the wire
30s - Q7
What happens to the direction of the induced current when the orientation of the magnet or coil is reversed?
The induced current becomes weaker.
The induced current remains the same.
The induced current becomes stronger.
The induced current changes direction.
30s - Q8
A generator can be turned into a motor by:
Increasing the strength of the magnetic field
Increasing the speed of rotation
Changing the direction of the current
Increasing the voltage supply
30s - Q9
The strength of an electromagnet can be increased by:
Decreasing the number of turns in the coil
Using a soft iron core inside the coil
Decreasing the current passing through the coil
Increasing the resistance of the wire
30s - Q10
What type of magnet is induced when electricity flows through a coil of wire?
Permanent magnet
Magnetic field
Electromagnet
Temporary magnet
30s - Q11
A solenoid with more turns of wire produces
A weaker magnetic field
A stronger magnetic field
No change in the magnetic field strength
Electromagnetic radiation
30s - Q12
What happens to the strength of the magnetic field inside a solenoid when the current passing through it is increased?
The magnetic field strength increases
The magnetic field strength decreases
The magnetic field strength remains the same
The magnetic field becomes non-uniform
30s - Q13
Which of the following materials is most commonly used as a core for electromagnets?
iron
Aluminum
copper
zinc
30s - Q1430s