p4.2.2

Question 1

what happens when we place a conductor carrying a current within an existing magnetic field

Answer 1

the two fields interact with each other and the force is exerted on the wire

Question 2

what to we have to make sure of in order to make the coil spin continuously

Answer 2

the current needs to move in on the right and go out on the left

Question 3

what does a split ring commutator allow

Answer 3

it allows the current to flow the same way from the battery but change halves of the coil as it spins

Question 4

in a motor we use a….

Answer 4

split ring commutator

Question 5

does a split ring commutator change the direction of coil spinning

Answer 5

no

Question 6

in a split ring commutator which coil goes up and which goes down

Answer 6

the force on left is always up, force on the right of the coil is always down
continuous motion in one direction

Question 7

what happens when the commutator turns vertical

Answer 7

there isn’t current flowing, but it will continue to turn because it has momentum

Question 8

how can the speed of the motor be changed

Answer 8

• change magnitude of current
• change the strength of magnetic field
• change the number of coils in the wire
• change the length of wire