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Worksheetsforce on current carrying conductor
Total questions: 20
Worksheet time: 9mins
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
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
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
c represented by
direction of magnetic field
direction of rotation
direction of force
direction of magnitude current
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 coil placed between the poles of a permanent magnet and is connected to the external circuit.Determine the direction of rotation of the coil when the switch is closed.
Clock wise
Anti Clock wise
Alternately, anticlockwise then clockwise
Alternately, clockwise then anticlockwise
Diagram shows a coil placed between two opposite magnetic poles. An electric current flows through the coil producing a pair of turning force, F.Which diagram shows the correct catapult field ?
Diagram shows a current–carrying conductor placed between the poles of two magnet bars. Which diagram shows the resulting magnetic field ?
Diagram shows a current – carrying conductor in magnetic field. What is the direction of the force that acts on the conductor ?
A
B
C
D
The speed of direct current motor can be reduced by
increasing the amount of current
increasing the strength of magnet
increasing number of turns of coil
increasing the resistance of coil wire
A wire carries a current, creating a magnetic field around itself as shown. The current in the wire is:
Directed to the right
Directed to the left
Equal to the magnetic field
In the same direction as the magnetic field
Diagram shows a current – carrying conductor in magnetic field. What is the direction of the force that acts on the conductor ?
A
B
C
D
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
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
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
SPM 2013, Diagram shows a plotting compass placed on a cardboard near the current carrying conductor. Which compass shows the correct direction of the magnetic field?
A
B
C
D
