Chapter 16

Question 1

Electric fields

Answer 1

Is a region in which change will experience a force

• they have the same direction as the direction at the force positive charges of article at a point in that field
• fields always go away from positive charges and towards negative charges

Question 2

Electric field

Answer 2

Positive- Electric’s field stephen a positive charge points outwards

Negative - the electric field around a negative changed points inwards

Question 3

Attraction

Answer 3

Attraction of oppositely charged objects

A positive and negative object

Question 4

Repulsion

Answer 4

2 positives - repulse of like charged objects (away from point)

2negatives - repulse of like charged objects(inwards on points)

Question 5

Non - magnetic

Answer 5

Domain are not lined up in any direction

Question 6

Magnetic

Answer 6

Domains are lined up in one direction

Question 7

Domain

Answer 7

A magnet can be thought of as many small magenta called domains

Question 8

Methods of magnetization

Answer 8

1. rubbing a non-magnetic ferrous metal in one direction with a magnet
2. Exposing a non-magnetic ferrous metal to a very strong magnetic field for a prolonged period

Question 9

Demagnetizing a magnet

Answer 9

1.hammering the magnet
2.expose yo an alternating magnetic field
3.

Question 10

Soft and hard

Answer 10

Soft: magnetic materials that magnetize and demagnetize easily. Eg: iron

Hard: magnetic materials that magnetize and demagnetize are difficult. Eg: chromium

Question 11

Electromagnets

Answer 11

=are temporary magnets that only exhibit magnetism when current flows through them. They comprise of a conducting coil (usually copper) wound round to make a solenoid

Question 12

How can strength of a electromagnet be increased

Answer 12

• increasing number of turns on a coil
• increasing current passing the coil
• adding a soft iron core