Magnetism

Question 1

Define magnetic induction

Answer 1

Magnetic induction is the process where a magnetic material becomes a magnet when placed close to a strong magnet or within a current carrying solenoid

Question 2

Define a magnetic field

Answer 2

A magnetic field is a region in which the force of magnetism acts

Question 2

How to magnetise magnetic materials

Answer 2

• Stroking
• Use direct current

Question 3

How to demagnetise magnetic materials

Answer 3

• Heating a magnet then letting it cool in the east-west direction causes ‘tiny magnets’ to lose their alignment
• Hammering a magnet in the east-west direction alters alignment of ‘tiny magnets’
• Put magnet in solenoid in east-west direction, connect solenoid to a.c. supply then withdraw magnet when a.c. still flowing