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WorksheetsElectromagnetism SPM
Total questions: 20
Worksheet time: 23mins
Diagram below shows the apparatus used to study the effect of an electromagnet.
Which change will increase the number of paper clips attracted to the iron rod?
Use a thinner wire to form the coils
Use a non-insulated wire to form the coils
Reduce the number of coils
Increase the magnitude of the current
Diagram below shows a simple transformer.
The bulb lights up at normal brightness.
What happens if the a.c. input is replaced by a 3 V battery?
The bulb does not light up
The brightness of the bulb remains unchanged
The brightness of the bulb increases
The bulb blows
Particles with opposite charges ____________ and particles with same (or like) charges ____________.
attract, repel
repel, repel
attract, attract
repel, attract
Which side of this picture would be a north pole?
A
B
Which of the following will most affect the strength of a magnetic field inside a solenoid?
the diameter
the number of coils
the current
the number of coils & the amount of current
Which coil will have the largest flux?
A
B
C
D
Which way will the wire move?
What happens when an electric current flows through a wire?
The wire begins to spin.
Nothing happens.
A field of gravity is created around the wire.
A magnetic field is created around the wire.
A student moves a magnet into a coil of wire as shown in the diagram. The coil of wire is connected to a sensitive ammeter. How to increase the reading of ammeter??
increasing the number of turns on the coil
increasing the speed of the magnet
increasing the strength of the magnet
all of the above
What device changes mechanical kinetic energy into electrical energy?
electric motor
insulator
electromagnet
generator
