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WorksheetsReview: Magnetism and Electromagnetism
Total questions: 20
Worksheet time: 18mins
What is the definition of magnets?
Any objects that can be influenced by magnetic field is called (a)
when a charge is moving in a magnetic field, it will feel
current
potential
force
speed
which of these statements are true.... (more than one option correct)
Same poles will repel
permanent magnet lose its magnetism easily
the strongest part of magnet is its poles
if the field lines are separated, the B-field is stronger
Magnet always comes in pairs. There is no magnetic (a)
What is the name of this device
(a)
A device that is use to change the number of voltage transfer from power station to buildings or houses is called....
Dynamo
Generator
Solenoid
Transformer
Take a look on this picture. If the current is flowing from A to B, choose the correct statement... (there are two correct answers)
There will be a force that pushes the wire up
B field above the wire is weaker than below the wire
B field above the wire is stronger than below the wire
There will be no force acting on the wire
Draw the magnetic field lines!
When a charge passes through a uniform B-Field in a direction indicated, the charge will feel a magnetic force going into the page
True
False
When a charge moving in a perpendicular direction to a B-Field, the force experience by the charge is equal to zero.
True
False
Two parallel wires that have opposite direction of current will (a) each other
A device that is used to make a charge accelerate in a circular path called....
Transformer
Dynamo
Loudspeaker
Cyclotron
Which of these type of transformer that is used to produce decreased output voltage
Step down
Step up
which of these object is made from a magnetic material
rubber band
piece of paper
steel nail
wooden rod
Which of these statements are correct regarding to this picture (two answers are correct)
The current produced by the system is direct current
B-Field produced by the system is changing
To increase the induced voltage, we should add more coil
Induced voltage can not be created by the system
A step up transformer has 100 turns on its primary coil and 20.000 turns on the secondary coil. Calculate the output voltage (measured in volts) if the input voltage is 12 V
(a)
When a voltage of 12 V is applied across the primary coil of a step-down transformer, there is a current of 0.4 A in the primary coil. Calculate the current (measured in ampere) in the secondary coil if the voltage induced across it is 2 V. Assume that the transformer is 100% efficient.
(a)
Look at this picture. Which of these statements is the correct way to increase the induced current?
Put the magnet near the coil and let it rest.
Turn the coil into a straight wire
Use the stronger wire for the coil
Move the magnet more fast
Which of these statements are the correct characteristic for a step-up transformer? (two answers are correct)
The primary coil has more number of turns than the secondary coil
The output voltage is less than the input voltage
The input voltage is less than the output voltage
The primary coil has less number of turns than the secondary coil
