Physics

Question 1

what is a magnet

Answer 1

a magnet is an object or material that creates a magnetic field

Question 2

How do you draw magnetic field lines

Answer 2

1)draw a bar magnet with north and south pole.
2)draw lines going in from one pole and out through the other(include arrow for direction)
3) draw lines going from the top of one pole to another. do the same for the bottom

Question 3

What does the lines being closely together mean

Answer 3

the more dense the field lines, the stronger the magnetic field is in that area

Question 4

how do we find the field lines

Answer 4

use a compass
1)the needle of the compass has tiny bar magnet which lines up with field line of whichever magnetic field put in.
2)it will then point towards south pole and tell you where north pole is

Question 5

how to show the interaction between two like poles(the same)

Answer 5

The interaction will repel
1)draw two bar magnets that are the same . and draw lines going for both poles going outwards in opposite direction

Question 6

how to show the interaction between two unlike poles

Answer 6

the interaction will attract
1)draw two bar magnets that are different. and draw lines going from one pole into the other.

Question 7

what is a magnetic material

Answer 7

any object that has potential to become a magnet

Question 8

4 Types of magnetic materials

Answer 8

iron, cobalt,steel,nickel

Question 9

what is a permanent magnet

Answer 9

produces own magnetic field

Question 10

what is an induced magnet

Answer 10

has magnetic field temporarily

Question 11

what is the force between an induced and permanent magnet

Answer 11

always attractive

Question 12

What is a material called when it loses magnetism easily

Answer 12

magnetically soft

Question 13

name a material that loses magnetism quickly

Answer 13

iron

Question 14

what is a material called when it loses magnetism slowly

Answer 14

magnetically hard

Question 15

name a material that loses magnetism slowly

Answer 15

steel

Question 16

what does electromagnetism mean

Answer 16

where electric current produces own magnetic field

Question 17

what is the right hand rule

Answer 17

when your thumb shows the direction of the current and the rest of your coiled hand shows direction of magnetic field

Question 18

how do you use the right hand rule

Answer 18

curl you hand and put your thumb up
2)your thumb will the point in the currents direction
3)your fingers will point towards magnetic field direction

Question 19

what is a solenoid

Answer 19

cylindrical coil of wire

Question 20

what is the magnetic field like inside the solenoid

Answer 20

strong and uniform

Question 21

what happens if you bend the current carrying wire inside the solenoid

Answer 21

increases the strength of the magnetic field produced

Question 22

By reversing the direction of the magnetic field you….

Answer 22

reverse the direction of the current

Question 23

4 ways to increase an electromagnets strength

Answer 23

increase current
increase number of coils while keeping length the same
decrease the length
add iron core through the middle

Question 24

what is the motor effect

Answer 24

a current carrying wire in a magnetic field experiencing a force

Question 25

how does the motor effect work

Answer 25

a current carrying wire will produce own magnetic field if you place a wire between north and south pole (as they carry produce magnetic field ) the two magnetic field will interact which puts force on the wire

Question 26

how can a wire experience full force in the motor effect

Answer 26

by putting it perpendicular(90 degrees)

Question 27

what is flemings left hand rule

Answer 27

thumb=direction of the force finger=direction of magnetic field middle finger= direction of the current

Question 28

how to calculate the strength of the force

Answer 28

F=BIL force= magnetic flux density x current x length

Question 29

what is an electric motor

Answer 29

a current carrying wire in a magnetic field rotating

Question 30

what is a split ring commutator

Answer 30

keeps the motor spinning in one direction

Question 31

how does the split ring commutator make the coil rotate in 1 direction

Answer 31

current flows through the coil, creating a magnetic field around it. This interacts with the magnetic field of the permanent magnets, producing a force on each side of the coil The forces act in opposite directions on each side, making the coil rotate. After half a turn, the coil would stop or reverse because the forces would push in the opposite direction. The split-ring commutator reverses the current every half-turn, which reverses the direction of the forces.

Question 32

three ways to increase speed in electric motor

Answer 32

increase current add more turns to the coil increase magnetic flux density