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WorksheetsELECTROMAGNETIC FEILDS
Total questions: 21
Worksheet time: 27mins
The pattern of the magnetic field produced by the straight current carrying conducting wire is
in the direction opposite to the current
in the direction parallel to the wire
circular around the wire
in the same direction of current
What is the shape of a magnetic field around a wire?
A coil of wire with a current is called a _______. The two ends of this act like the poles of a magnet. It is a weaker electromagnet.
compass
bar magnet
solenoid
circuit
A current carrying conductor is held in exactly vertical direction. In order to produce a clockwise magnetic field around the conductor, the current should be passed in the conductor:
From top to bottom
From left to right
From bottom to top
From right to left
What direction would the wire move? (What direction does the force act?)
Up
Down
Left
Right
6. the most suitable material for making the core of an electromagnet is
soft iron
Brass
aluminium
steel
Dynamo works on the principle of
Electro magnetic induction
Conversion of energy to electricity
Magnetic effects of electric current
Heating effects of current
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
The production of electric current by a changing magnetic field is called ____________________________________.
induced current
electromotive force
electromagnetic induction
internal resistance
Which of the following increases frequency of AC?
increasing number of turns on the coil
using a stronger magnet
rotating the coil faster
increase area of the coil
In order for electromagnetic induction to occur, you need...
a conductor
a magnetic field
relative motion
all three
Protons are ______________ charged.
Positively
Negatively
Super
Two negatively charged particles will _________________ each other.
Repel
Attract
Do nothing
Which of the following shows an interaction between two positively charged particles?
The area (or space) where a magnet can exert a force is called the _________________________.
Magnetic Zone
Magnetic Field
Magnetic Power
Which of the following is used to change an open circuit into a closed circuit?
Switch
Bulb
Battery
