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Worksheets3.2 Force on a current carrying conductor
Total questions: 20
Worksheet time: 10mins
Magnetic field produced around a straight conductor due to current in it is given by
Fleming's right hand rule
Right hand grip rule
Clock rule
Fleming's left hand rule
b) based on the diagram above, choose the direction of the forces that act on the sides AB and CD of the coil.
AB:UPWARD;CD:DOWNWARD
AB:DOWNWARD;CD:UPWARD
c) What is the rule that is used to determine the direction of the force that acts on the coil?
(a)
b) based on the diagram above, choose the direction of the forces that act on the sides AB and CD of the coil.
AB:UPWARD;CD:DOWNWARD
AB:DOWNWARD;CD:UPWARD
The figure shows the structure of a motor. Which of the following will not affect the speed of rotation of the motor?
The current in the coil
Strength of the magnetic field
The number of turns of wire in the coil
The direction of the current in the coil
Figure 1 and Figure 2 show the structures of a d.c motor and a d.c. motor respectively. State the change of energy that occurs in a motor.
Electrical energy to kinetic energy
Kinetic energy to electrical energy
What does the thumb indicate in flemings left hand rule?
Force
Motion
Current
Magnetic field direction
What direction is the force/motion in the following diagram?
Perpendicular to the magnets
Downwards
Parallel and through the magnets
What angle must there be between a magnetic field and a conductor in order for the maximum force to be exerted?
180
45
90
270
Name one factor that does not affect the size of a force in on a current-carrying conductor placed in a magnetic field?
Gravity
Magnetic flux density/size of magnetic field
Size of the current
Length of the conductor
Name the effect that causes a coil of current-carrying wire in an electric motor to move.
The electromagnetism effect
The magnetic effect
The motor effect
Which rule can be used to work out which way a coil of wire rotates in a motor?
Fleming's left-hand rule
Fleming's right-hand rule
How does a split ring commutator work?
Swaps the contact evert full turn, so that the left-hand and right-hand arms of the coil always experience a force in the same direction.
Swaps the contact evert half turn, so that the left-hand and right-hand arms of the coil do not experience a force in the same direction.
Swaps the contact evert half turn, so that the left-hand and right-hand arms of the coil always experience a force in the same direction.
Why might a current-carrying wire be placed between a magnetic field?
To increase the current from the interaction of magnetic fields
To increase the voltage from the interaction of magnetic fields
To produce a force from the interaction of magnetic fields
A represented by
direction of magnitude current
direction of force
direction of magnetic field
direction of rotation
c represented by
direction of magnetic field
direction of rotation
direction of force
direction of magnitude current
When a current-carrying conductor is in a magnetic field of a permanent magnet, the interaction between the two magnetic fields produce a ...............................
The direction of the magnetic field, the current and the force acting on a conductor is perpendicular to each other.
What is the functions of commutator?
Reverse the direction of current in the coil every half rotation so that the coil continues to turn in same direction
To contact with the commutator so the current from the battery enters the coil.
Push the brush so it will always contact with the commutator.
Diagram shows a dc motor. What is the functions of brush carbon?
Push the brush so it will always contact with the commutator.
To contact with the commutator so the current from the battery enters the coil.
Reverse the direction of current in the coil every half rotation so that the coil continues to turn in same direction
Application of the force on current carrying conductor in a magnetic field
Moving coil ammeter
dynamo
Dc motor
electrIc bell
Dc generator
