P7: ELECTROMAGNETS + THE RIGHT HAND RULE

Question 1

What will a changing magnetic field induce?

Answer 1

an electric field

Question 2

What will a changing electric field induce?

Answer 2

a magnetic field

Question 3

What is the symbol that represents current going into the page?

Answer 3

⨂

Question 4

What is the symbol that represents current coming out of the page?

Answer 4

⊙

Question 5

What is the right hand rule?

Answer 5

-thumb of your right hand is direction of current
-fingers are the direction of the magnetic field

Question 6

What is a solenoid?

Answer 6

a long coil of wire that sets up a magnetic field when current flows through it

Question 7

Is the magnetic field stronger/weaker inside solenoid?

Answer 7

stronger inside solenoid

Question 8

Is the magnetic field stronger/weaker outside solenoid?

Answer 8

weaker

Question 9

What is an electromagnet?

Answer 9

-core (made from a magnetic material) placed inside a solenoid
-when current flows through the solenoid it magnetises the iron core

Question 10

How can the strength of an electromagnet be increased?

Answer 10

-increasing no. of coils
-increasing current

Question 11

What are the advs of an electromagnet compared to a permanent magnet?

Answer 11

-electromagnets can be turned on and off
-strength of electromagnets can be increased/decreased