P7 magnetism

Question 1

3 ways to strengthen a magnetic field in a solenoid

Answer 1

1) increasing the number of turns in the coil
2)put iron pieces inside the solenoid (iron core)
3) increasing current

Question 2

3 magnetic metals

Answer 2

cobalt
nickel
iron

Question 3

compass use is magnetism

Answer 3

shows the direction of the magnetic field with the use of a tiny bar magnet

Question 4

right-hand thumb rule

Answer 4

thumb-direction of current

curl your finger to show the direction of the magnetic field

Question 5

a solenoid without a core is called an

Answer 5

electromagnet whose magnetic field can be turned on and off with an electric current

Question 6

motor effect

Answer 6

a current-carrying wire/conductor (same thing) experiences a force when placed in between two magnets (pushing it out of the field)

Question 7

for the wire has to be 90 degrees to experience? (magnetism)

Answer 7

the full force of the magnetic field

if the wire runs parallel to the magnetic field it won’t experience any force at all

Question 8

flemming left-hand rule fingers represent

Answer 8

thumb-force
1st finger-direction of magnetic field (north to south pole)
2nd finger- flow of current

Question 9

the formula for calculating the strength of the force
(given in the exam so make sure you check for any conversions)

Answer 9

F=BIL
force(N)=magnetic flux density(T) x current (A) x length (m)

Question 10

unit for magnetic flux density

Answer 10

teslas T

Question 11

what will happen if a wire is placed at an angle instead of at 90 degrees in between 2 poles?

Answer 11

not the full force will act on the wire