Electromagnets

Question 1

State what causes a wire to produce a magnetic field

Answer 1

electric current

Question 2

Describe the pattern of the magnetic field around a straight wire carrying a current.

Answer 2

concentric circles

Question 3

State where the magnetic field around a wire is the strongest

Answer 3

closest to the wire

Question 4

Describe how the strength of the magnetic field around a wire changes if the current is increased

Answer 4

strength increases

Question 5

State the rule we can use to draw the magnetic of magnetic field pattern for a straight wire

Answer 5

right hand grip rule

Question 6

State the scientific name for a long coil of wire

Answer 6

solenoid

Question 7

Describe the magnetic field inside a solenoid.

Answer 7

strong and uniform

Question 8

Describe the pattern of the magnetic field around a solenoid

Answer 8

same as a bar magnet

Question 9

Name three ways that we can make the magnetic field of a solenoid stronger.

Answer 9

increase the current, increase the number of coils, add and iron core

Question 10

Describe what an electromagnet is.

Answer 10

a solenoid with an iron core

Question 11

State three advantages of using an electromagnet vs a permanent magnet

Answer 11

can be turned on and off, can change the strength, smaller