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WorksheetsElectromagnet Form 5 KSSM
Total questions: 25
Worksheet time: 6hrs 15mins
Diagram shows a right hand which represents the Fleming Right Hand Rule . X represent the
Current
Motion
Magnetic Field
Potential DIfference
Diagram 25 shows the setup of the apparatus to study the pattern of he magnetic field produced by the current in a straight wire
Which diagram shows the correct pattern direction of the magnetic field observed by the observer?
Diagram shows a bar magnet is moving towards a solenoid
What is the magnetic pole at both ends of the solenoid, X and Y?
X = South
Y = South
X = South
Y = North
X = North
Y = North
X = North
Y = South
Diagram shows a transformer that has efficiency 80%
If it produces an output power of 100 W, what is the amount of current flowing in the primary coil?
6.25 A
5.15 A
4.00 A
3.75 A
Diagram shows an electric motor
Which magnetic field pattern is correct when the switch is closed?
Diagram below shows a wire QR hangs freely between two strong magnets
The angle of deflection is increased by
increasing the current
changing the polarity of magnet
increasing the resistance of wire QR
increasing the distance between the poles of the magnet
Diagram below shows an electric generator
Which graph shows the correct output between voltage and time when the coil starts to rotate?
Diagram shows the primary coil of a transformer is connected to a 240 V a.c supply and an output voltage of 12 V is produced
What is the ratio of number of turns in the secondary coil , Ns to the number of turns in the primary coil, Np ?
40 : 2
4 : 24
1 : 20
2 : 40
Diagram shows a pattern of magnetic field produced by a current-carrying conductor
Which of the following will decrease the distance between the magnetic field lines?
Inverse the terminal of dry cell
Increase the number of dry cell
Decrease the thickness of connecting wire
Replace 1.5 V d.c dry cell with 1.5 V a.c power supply
The speed of direct current motor can be reduced by
increasing the amount of current
increasing the strength of magnet
increasing the number of turns of coil
increasing the resistance of coil wire
DIagram shows a charging car using a charging module.
Which of the following will increase the efficiency of the transformer used in the charging module?
Soft iron is used as a core
Aluminium is used as a core
Decrease the thickness of the coil of the transformer
Decrease the number of turns in secondary coil of the transformer
Diagram shows a simple transformer. The bulb does not light up.
Which modification will cause the bulb to light up?
Replace the 6V battery with a 9V battery
Increase the number of turns in primary coil
Decrease the number of turns in primary coil
Replace 6V battery with 6V a.c power supply
Diagram shows an activity to investigate factors affecting the magnitude of induced current
Which step will increase the magnitude of induced current?
Use more turns of coil
Use thicker wire of coil
Use bigger diameter of coil
Decrease the height, h of the magnet
Diagram shows transmission of electricity through National Grid Network.
What is the advantage of electricity transmission at high voltage?
High current flow
Increase the energy supply
Reduce the resistance of transmission cable
Reduce the heat dissipated in electrical cable
Diagram shows an ideal transformer
If the 60 W bulb is lit to its normal brightness, what is the value of the input current Ip?
0.025 A
0.1 A
0.25 A
2.5 A
The laminated soft iron core in the transformer is used to
Reduce resistance
Reduce eddy current
Prevent flux leakage
Magnetized and demagnetized iron core easily
Diagram shows an electromagnet
What are the polarities of the parts labelled P and Q?
P: North
Q : South
P : North
Q : North
P : South
Q : North
P : South
Q : South
The function of transformer in the transmission of electricity is to
change the voltage magnitude
increase the power
increase the resistance
reduce the time to transmit electricity
Diagram shows a coil of wire is wrapped round a soft iron core
Which of the following statement is TRUE?
The strength of magnet decreases by increasing resistance of R
End Y of the rod behaves as a north pole magnet
The polarity at the ends of the rod depends on the strength of the current in the circuit
End Y of the rod behaves as a south pole magnet
Soft iron core is used as transformer core because
Low resistance
Permanent Magnet
Easy to magnetized and demagnetized
Good conductor
Which of the following is not the characteristic of step up transformer?
Number of turns in the secondary coil is more than in primary coil
Secondary voltage is more than primary voltage
Secondary current is less than primary current
Secondary current is more than primary current
When the magnitude of induced current is maximum?
When the conductor cut across the magnetic field perpendicularly
When the conductor cut across the magnetic field parallel
When the magnet is move further apart
When the power supply increase
Electricity generated by the power station is transmitted at a high voltage transmission cables to residential areas because
the current decreases
the speed of transmission increases
the resistance of the cables decreases
some electric appliances at home require a high operating voltage
Diagram shows a transformer of 80% efficiency
What is the current in primary coil?
0.167 A
0.208 A
0.313 A
0.333 A
Diagram shows current carrying conductor in a permanent magnetic field
In which direction will the conductor move?
Out of paper
Into the paper
Upward
Downward
