Electromagnets

Question 1

True or false? Electrostatics can be useful for crop spraying in farming.

Answer 1

True

Question 2

Electric field lines go from…

Answer 2

Positive to Negative

Question 3

Will there be a force on a current-carrying wire in a magnetic field if the current and fields are parallel?

Answer 3

No

Question 4

What units are used to measure resistance? Give the full name, not the symbol

Answer 4

ohms or ohm

Question 5

What shape will the magnetic field around a straight wire carrying an electric current be?

Answer 5

Circular

Question 6

True or false? A piece of steel is permanently magnetised when placed near a magnet.

Answer 6

True

Question 7

Permanent Magnet

Answer 7

An object which always has its own magnetic

field. It cannot be switched on or off.

Question 8

Electromagnet

Answer 8

A temporary magnet produced using an electric field.

Question 9

Magnetise

Answer 9

Turn an object into a magnet.

Question 10

Magnetic Field Lines

Answer 10

Imaginary lines that show the direction of the

force on a magnetic material.

Question 11

Magnetic Material

Answer 11

A material that is attracted to a magnet, such

as, iron, steel, nickel, or cobalt.

Question 12

Magnet

Answer 12

A magnet has a north and a south pole and

generates it’s own magnetic field.

Question 13

What name is given to a magnet produced by an electric current?

Answer 13

Electromagnet

Question 14

If a wire carrying an electric current is placed in a magnetic field, a force is produced. What name is given to this effect?

Answer 14

motor effect

Question 15

True or false? A cable that connects an electrical appliance to the mains will have a magnetic field around it when the appliance is being used.

Answer 15

True

Question 16

The diagram shows a wire carrying an electric current. This wire is made from copper, which is not a magnetic material. Will the wire still move?

Answer 16

True

Question 17

The equipment shown below can be used to demonstrate the motor effect. Name the piece of equipment labelled in the diagram that will move to show the motor effect.

Answer 17

Rod

Question 18

True or false? Electromagnets are a type of permanent magnet.

Answer 18

False

Question 19

What effect would increasing the strength of the magnetic field have on the force caused by the motor effect?

Answer 19

Increase

Question 20

An advantage of electromagnets over bar magnets is that you can easily vary the __________ of the magnetic field. What word completes this sentence?

Answer 20

Strength

Question 21

True or false? Electricity is useful because it enables energy to be easily transmitted over long distances.

Answer 21

True

Question 22

name the component used in electric circuits that is sensitive to temperature

Answer 22

thermisistor

Question 23

Name the component used in electric circuits that is sensitive to light. Give the full name, not the abbreviation

Answer 23

light dependant resistor

Question 24

An object that gains electrons becomes… what?

Answer 24

negatively charged

Question 25

In a circuit with two identical components connected in parallel, the current which flows through its different branches will be __________. Which of the following completes the sentence?

Answer 25

the same

Question 26

Electric motors transfer energy to the load as useful work and waste energy in the __________ energy stores of the surroundings. What one word completes the sentence?

Answer 26

Thermal

Question 27

The symbol below represents a __________ __________ in a circuit. What TWO words complete the sentence?

Answer 27

closed switch

Question 28

True or false? Metals do not become charged because charges move easily through them rather than becoming stuck in one place.

Answer 28

True

Question 29

A current-carrying wire will have a __________ field around it. What is the missing word?

Answer 29

Magnetic

Question 30

A copper wire is held between two magnets as shown below. Will there be a potential difference across the ends of the wire if it is moved vertically upwards?

Answer 30

Yes

Question 31

The motor effect happens because the current-carrying wire produces a __________ __________ that interacts with the field of the magnet. What two words complete this sentence?

Answer 31

Magnetic Field

Question 32

The diagram shows a simplified version of a generator. What type of current will it generate?

Answer 32

alternating

Question 33

True or false? Electromagnets are a type of permanent magnet.

Answer 33

False

Question 34

True or false? A current-carrying straight wire placed in a magnetic field can move because it experiences a force.

Answer 34

True

Question 35

When a piece of iron is placed next to a magnet it also becomes magnetised. This type of magnetism is called __________ magnetism. What word completes the sentence?

Answer 35

Induced

Question 36

ferrous

Answer 36

containing iron

Question 37

Is steel a ferrous metal?

Answer 37

yes

Question 38

Maxine and Jerry are in a science lab trying to make a magnet. Maxine suggests stroking a piece of steel with a bar magnet in one direction. Jerry thinks it is better to stroke the piece of steel in both directions with the bar magnet. Who is correct?

Answer 38

Maxine

Question 39

What can be used to plot the magnetic field around a bar magnet?

Answer 39

compass

Question 40

What name is given to the amount of work done in a given time?