Understanding Electric Motors

What happens when a wire carrying an electric current is placed in a perpendicular magnetic field?

• It rotates around the magnetic field

• It remains stationary

• It interacts with the magnetic field creating motion

• It is pushed in the direction of the magnetic field

What rule is used to determine the direction of a magnetic field around a wire?

• Newton's third law

• Right-hand thumb rule

• Maxwell's corkscrew rule

• Fleming's left-hand rule

What effect is observed when magnetic fields above and below the wire run in opposite directions?

• The fields strengthen each other

• The fields cancel each other out

• The wire is pushed upwards

• No effect is observed

What causes the wire to be pushed vertically upwards out of the magnetic field?

• The weakening of the magnetic field below the wire

• The strengthening of the magnetic field above the wire

• The wire being pushed away from the strong field towards the weak one

• The wire attracting the magnetic fields

What happens when the current in the wire is reversed?

• The magnetic fields are neutralized

• The wire stops moving

• The wire experiences a force in the opposite direction

• The wire moves in the same direction

How is circular motion achieved in an electric motor setup?

• By increasing the magnetic field strength

• By placing the wires in parallel

• By reversing the current repeatedly

• By linking the wires and allowing rotation

What increases the turning force on an electric motor?

• Using stronger magnets

• Looping the wire around many times

• Increasing the current flow

• Decreasing the number of wire loops

Why is it important for the upward and downward forces to always be on the same side in an electric motor?

• To ensure efficient energy use

• To maintain consistent motor speed

• To prevent the motor from overheating

• To facilitate continuous rotation

What is the purpose of a split ring commutator in an electric motor?

• To maintain constant rotation

• To ensure the current always flows in the same direction

• To increase electrical resistance

• To reduce friction

What is the main function of the split ring commutator?

• To control the speed of the motor

• To keep the motor running smoothly by reversing the current direction

• To connect the motor to the power source

• To convert AC to DC