Magnets

Question 1

Magnetic field

Answer 1

A region where magnetic materials experience a force

Question 2

Current-carrying wire

Answer 2

Electric current in a material produces a magnetic field around it
-larger electric current produces a a stronger magnetic field

Question 3

Motor effect

Answer 3

When a current-carrying wire is put in a magnetic field it experiences a force (as long as it’s not parallel)

Question 4

Left hand rule

Answer 4

1 - first finger (field)
2 - second finger (current)
3 - thumb (force)

Question 5

Electric motors speed factors

Answer 5

• more current
• more turns on the coil
• stronger magnetic field
• soft iron core

Question 6

Split-ring commutator

Answer 6

Swapping contacts every half turns so it rotates the same direction

Question 7

Electromagnetic induction

Answer 7

Inducing a voltage in a wire which is experiencing a change in magnetic field

Question 8

Dynamo effect

Answer 8

Using electromagnetic induction to convert KE into electrical energy

Question 9

Bigger voltage (EM induction)

Answer 9

• strength of the magnet
• number of turns on the coil
• speed of movement

Question 10

Slip rings and brushes

Answer 10

So the contacts don’t swap every half turn