ELECTROMAGNETISM MODULE1

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14 questions
• 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

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

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
• Q14
30s

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