6. What would make the direction of the force on the wire change?
a change in the direction of the current a change in the direction of the magnetic field.
a change in the direction of the current or the size of the current
a change in the direction of the magnetic field or a change in the size of the current
7. How is the speed of the motor increased?
increasing the size of the current
changing the direction of the current
8. How can the direction of the motor be reversed?
reversing the direction of the current
reversing the direction of the potential difference
9. Why does the coil spin when the current passes through the coil?
A force moves on either side due to the motor effect
A force moves on neither side of the coil due to the motor effect
10. Why does the coil spin when the current passes through the coil?
the force is different strengths on each side of the coil
the forces go in opposite directions either side of the coil
the force is the same on both sides
11. What does the split-ring commutator do?
changes the direction of the current every half tun
keeps the direction of the cur
12. The sides swap over every half turn so the coil is pushed in different directions
False
True
13. The sides swap over every half turn so the coil is pushed in the same direction
True
False
14. The sides do not swap.
False
True
15. What happens if a wire cuts through magnetic field lines?
a potential difference is induced across ends of the wire
a current is induced across the ends of the wire
16. What happens if a magnet is moved into a coil of wire?
a potential difference is introduced across the ends of a wire
a current is introduced across the ends of the wire
17. What happens if the wire or coil is part of a complete circuit?
A current is induced in the circuit
A p.d is induced in the circuit
18. The size of the induced potential difference is increased by increasing....
the strength of the magnetic field
the number of turns on the coil
all of the above
The speed of movement
the area of the coil
19. What happens in a dynamo?
A magnet spins, causing magnetic frild lines to continuously cut across the wires of a coil.
A magnet spins, causing magnetic field lines to continuously cut across the wires of a coil, this induces an alternating p.d and an alternating current.
ABBA.
A magnet spins, causing magnetic frild lines to continuously cut across the wires of a coil, inducing an alternating pd.
A magnet spins, causing magnetic frild lines to continuously cut across the wires of a coil, inducing an alternating current.
20. What happens in a generator?
a coil is inside a moving magnetic field
a coil is rotated inside a stationary magnetic field
a coil is rotated inside a moving magnetic field.
a coil is stationary inside a stationary magnetic field
