Topic 12

Question 1

ways to strengthen an electromagnet

Answer 1

coiling wire
increasing current
adding a magnetic core for example iron

Question 2

how does adding a metal core increase the strength

Answer 2

adding a magnetic metal to the core of the solanoi will increase the overall strength of the field because it induces a temporary magnetic field into the iron as it’s a soft magnetic material. This magnet field combines with that of the solenoid creates an even stronger overall magnetic feild

Question 3

right hand grip rule for solenoids

Answer 3

fingers in the direction of the electrical current flowing around the coil
thumb points towards teh north pole end of the coil

Question 4

((()))

Answer 4

concentric circles
when a current is passed through the wire there is a magnetic field in the shape of concentric circles around the wire

Question 5

direction of magnetic field depends on

Answer 5

of current/ flow of electrons

Question 6

X

Answer 6

shows magnetic field/ electrical current into the page

Question 7

O (with dot)

Answer 7

electrical current/ magnetic field out of page

Question 8

where are electrical field lines strongest?

Answer 8

closer to the wire as field lines are closer together

Question 9

Solenoid

Answer 9

coil of wire

Question 10

magnetic materials

Answer 10

iron, nickel, cobalt and stainless steel

Question 11

magnets attract

Answer 11

objects made of magnetic materials

Question 12

magnetically soft material

Answer 12

loose magnetism really easily and make temporary magnets

Question 13

magnetically hard material

Answer 13

keep their magnetism and make permanent magnets

Question 14

magnetic poles

Answer 14

field is strongest

Question 15

magnetic field

Answer 15

area around magnetic material which experiences a magnetic force

Question 16

field lines

Answer 16

north to south

Question 17

fleming’s left hand rule

Answer 17

thumb = force
pointer = magnetic field
middle = current