12.7-12.14 -Current and Forces

Question 1

How can a current create a magnetic affect

Answer 1

It creates a circular magnetic field around the wire

Question 2

What does the strength of the field depend on?

Answer 2

.The size of the current

.Distance from the long straight conductor

Question 3

What do the fields from individual coils in a solenoid do?

Answer 3

.Add together to form a very strong almost uniform field along the centre of the solenoid
.Cancel to give a weaker field outside the solenoid

Question 4

What does a current carrying conductor experience when placed near a magnet?

Answer 4

A force

Question 5

If a current carrying conductor is placed near a magnet what will a magnet experience?

Answer 5

.An equal and opposite force

Question 6

What are magnetic forces due to?

Answer 6

Interactions between magnetic fields

Question 7

What rule can be used to represent the relative direction of a force?

Answer 7

Flemings left hand rule

Question 8

In Flemings Left hand rule, what does the first finger represent?

Answer 8

.Field

Question 9

In Flemings left hand rule what does the second finger represent?

Answer 9

.Current

Question 10

In Flemings left hand rule what does the thumb represent

Answer 10

.Movement

Question 11

What is the force on a conductor in magnetic fields used for?

Answer 11

.To cause rotation in electric motors