4.7.2 The motor effect (might come up) P2

Question 1

What is produced when current flows through a conducting wire

Answer 1

A magnetic field is produced around the wire

Question 2

What determines the strength of the magnetic field around a current-carrying wire

Answer 2

The magnitude of the current flowing through the wire

The distance from the wire

Question 3

What is a solenoid

Answer 3

A coil of wire which when current passes through creates a strong magnetic field

Question 4

Describe the magnetic field found inside a solenoid

Answer 4

Strong and uniform

Question 5

What is an electromagnet

Answer 5

A solenoid with an added iron core

Adding the iron core increases the strength of the magnetic field

Question 6

What is the motor effect

Answer 6

When a force is exerted between a magnetic field and a current-carrying conductor placed in that field

Question 7

What rule is used to determine the force experienced due to the motor effect

Answer 7

Fleming’s left hand rule

Question 8

When using Fleming’s left hand rule, what does the forefinger represent

Answer 8

Points in the direction of the magnetic field

Question 9

What using Fleming’s left hand rule what does the second finger represent

Answer 9

Second finger points in the direction of current flow in the conductor

Question 10

What factors affect the size of the force on a current-carrying wire in a magnetic field

Answer 10

The magnitude of the current flowing through the conductor

The strength of the magnetic field that the conductor is place in

Question 11

If the direction of a current in a current-carrying wire placed in a uniform magnetic field is reverse, what happens to the force

Answer 11

The direction of the force is reversed

Question 12

If the strength of the current in a current carrying wire placed in a uniform magnetic field is increases, what happens to the force

Answer 12

Strength of force is increased