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ELECTRICITY AND MAGNETISM Flashcards | StudBud
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ELECTRICITY AND MAGNETISM
ELECTRICITY AND MAGNETISM
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Answers
1
It occurs when an object builds up a negative charge
Electrical current
Static electricity
2
After rubbing, why does the plastic tube attract the wool?
The tube is negatively charged and the wool is positively charged
The tube is positively charged
They are both negatively charged
They are both neutral
3
How can static electricity be created?
By heating metal
By rubbing two objects together
By freezing an object
By putting objects in water
4
What it means electrical insulators?
It means that allow electrons to flow easily
It means that dont allow electrons to flow easily
5
It forms when there is a flow of electrons through conductors, such as copper and aluminium?
Electrical current
Static electricity
6
What is a magnetic field?
A type of energy that generates light.
The point at which a magnet loses its magnetic properties.
A specific type of metal that is attracted to magnets
The area around a magnet where its force has an effect
7
What was the main difference between “wet compasses” and “dry compasses”?
Wet compasses were more accurate.
Wet compasses had a face that floated on water. Dry had a niddle on a pivot
Dry compasses were larger in size
Wet compasses were designed for water travel only.
8
All matters is made of particles called:
Atoms
Electrons
Protons
Neutrons
9
Atoms are composed of three smaller particles:
Metals, magnets and atoms
Magnets, light and dark
Protons, neutrons and electrons
10
Neutrons have no charge. They are neutral
True
False
11
What is electricity?
Form of energy that use to provide power to machines and electronic devices
Attract certain metals, such as iron, nickel and cobals
12
Which of the following is an example of static electricity?
A phone charging
A battery-powered fan
A lightbulb turning on
Lightning during a storm
13
What happens when you rub a plastic tube with wool?
The wool and the tube become neutral
The wool becomes negatively charged
The plastic tube loses electrons
The plastic tube gains electrons
14
What is the definition of magnetism according to the text?
The ability to attract certain materials like iron, nickel, and cobalt
The ability of certain metals like gold and silver to conduct electricity
The process of creating artificial magnets from non-magnetic materials
The force that causes objects to fall towards the Earth.
15
Which of the following is an example of a natural magnet?
compass needle
Magnetite
refrigerator magnet
Electromagnet
16
Protons have a positive charge
True
False
17
The Earth has a core of liquid iron that acts like a giant magnet with a:
North magnetic pole
All the answers are correct
South magnetic pole
18
What kind of forms of electricity they are?
Electrical current
Static electricity
All the answers are correct
19
According to the text, when were the first compasses used?
The Age of Exploration.
Medieval Times
Ancient Roman times.
The Renaissance period.
20
What happens when two objects have opposite electrical charges?
They disappear
They repel each other.
They attract each other.
They stay neutral.
21
What is the primary function of the Earth’s enormous magnetic field?
To generate the Earth’s gravity
To help birds navigate during migration
To protect us from harmful cosmic radiation.
To attract meteors towards the Earth.
22
Rubber and plastic allow electrons to flow easily
True
False
23
What substance makes up the Earth’s core, which acts like a giant magnet?
Solid rock
Molten copper
Liquid iron
Gaseous helium
24
What does a compass needle always point towards?
The geographical East.
North
The strongest magnetic field nearby
The South Magnetic Pole.
25
What happens when two objects have the same electrical charge?
They combine
They attract each other.
They repel each other.
They lose their charge
26
____________ only have a temporary magnetic force
Induced
Permanent
27
The closed circuit has 4 basic parts:
Power source, connectors, magnetic and open circuit
Power source, conductor, switch and load
28
How can induced magnets be described based on the text?
They are created by combining opposite magnetic poles.
They are always permanent and never lose their magnetism
They only have a temporary magnetic force.
They are naturally occurring minerals found in the Earth
29
___________ magnets never lose their magnetism
Induced
Permanent
30
What is true about electrons and atoms?
Electrons have a negative charge and move around the nucleus.
Electrons have a positive charge and stay in the nucleus
Atoms always have more electrons than protons
Electrons and protons have the same charge
31
what forms the nucleus of an atom?
Protons and neutrons
Electrons
32
Rubber an plastic are electrical insulators
True
False
33
What happens when two identical magnetic poles (e.g., North and North) are brought close together?
They attract each other.
They repel each other.
They create a stronger magnetic field.
They lose their magnetic force.
34
An electrical circuit can flow through a closed circuit
True
False
35
How can we change the electrical charge of an object?
By adding or removing electrons
By adding or removing protons
By changing its color
By increasing its temperature
