Magnetism

Question 1

What are the two poles of a magnet?

Answer 1

North and South pole

Every magnet has a North and South pole.

Question 2

What do like poles do?

Answer 2

Repel

Opposite poles attract.

Question 3

In which direction do magnetic field lines flow outside a magnet?

Answer 3

North → South

Inside the magnet, they flow South → North.

Question 4

What does a compass align with?

Answer 4

Earth’s magnetic field

It points toward Earth’s magnetic South Pole.

Question 5

Why does a compass needle point north?

Answer 5

It aligns with Earth’s magnetic field.

Question 6

What happens if you cut a magnet in half?

Answer 6

You get two smaller magnets, each with a North and South pole.

Question 7

What does a current-carrying wire produce?

Answer 7

A magnetic field around it.

Question 8

What does the thumb represent in Right-Hand Rule #1 (RHR #1)?

Answer 8

Current direction.

Question 9

What do the fingers represent in Right-Hand Rule #1 (RHR #1)?

Answer 9

Magnetic field loops.

Question 10

What happens to the magnetic field if current increases?

Answer 10

The magnetic field becomes stronger.

Question 11

Which direction does the magnetic field circle a vertical wire?

Answer 11

Counterclockwise when viewed from above.

Question 12

What is a solenoid?

Answer 12

A coil of wire.

Question 13

What does a solenoid behave like when current flows?

Answer 13

A bar magnet.

Question 14

What does the thumb represent in Right-Hand Rule #2 (RHR #2)?

Answer 14

Direction of North Pole of the coil.

Question 15

What is the characteristic of the magnetic field inside the solenoid?

Answer 15

Strong and uniform.

Question 16

How can you increase the magnetic field strength inside a solenoid?

Answer 16

Increase current or number of coils.

Question 17

What are electromagnets?

Answer 17

Magnets that require current and can be turned on/off.

Question 18

What factors affect the strength of an electromagnet?

Answer 18

• Current
• Number of coils
• Core material

Question 19

What are permanent magnets?

Answer 19

Magnets with a fixed magnetic field that don’t require electricity.

Question 20

What advantages do electromagnets have?

Answer 20

They can be turned on/off and their strength can be adjusted.

Question 21

What happens to a wire carrying current in an external magnetic field?

Answer 21

It experiences a force.

Question 22

What does the palm represent in Right-Hand Rule #3 (RHR #3)?

Answer 22

Direction of force on the wire.

Question 23

What orientation produces no magnetic force on a wire?

Answer 23

When current is parallel to the magnetic field.

Question 24

What is magnetic flux?

Answer 24

Amount of magnetic field passing through a loop.

Question 25

What does Faraday's Law state?

Answer 25

A change in magnetic flux induces voltage (EMF).

Question 26

What can affect the induced voltage according to Faraday's Law?

Answer 26

* How quickly flux changes * Number of loops present

Question 27

What are generators used for?

Answer 27

Convert mechanical → electrical energy.

Question 28

What are motors used for?

Answer 28

Convert electrical → mechanical energy.

Question 29

What is Ohm's Law?

Answer 29

V = IR (Voltage = Current × Resistance).

Question 30

If voltage increases and resistance stays the same, what happens to current?

Answer 30

Current increases.