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WorksheetsMEEC
Total questions: 42
Worksheet time: 42mins
Refer the diagram. 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
n the same direction as the magnetic field
Refer the diagram. The right face of the loop acts as North pole and left side of loop acts as south pole
False
True
Magnetic field inside a long solenoid carrying current is
same at all points
different at poles and at the centre
zero
different at all points
The relative strength of the magnetic field is shown by the degree of closeness of the field lines.
false
true
can't say
No two field-lines are found to cross each other.
true
false
A wire is parallel to the lines of the force of the magnetic field and the current flows in the wire. Then
The wire will experience a force along the direction of the magnetic field
The wire will not experience any force
The wire will experience the torque
The wire will experience a perpendicular force
In an electric motor, the direction of current in the coil changes once in each:
One-fourth rotation
Half rotation
One rotation
Doesn't change
Identify the poles of the magnet in the given figure.
NORTH
SOUTH
One is north and the other is south
Can't predict
A soft iron bar is inserted inside a current-carrying solenoid. The magnetic field inside the solenoid will
Increase
Decrease
Remains same
Becomes zero
Which of the following diagrams correctly shows the magnetic field produced by a current- carrying wire?
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
Give two ways you can reverse the direction of a basic dc motor?
Reverse the current
Keep the current the same
Reverse the magnetic field
Keep the magnetic field the same
How does a split ring commutator work?
Swaps the contact evert full turn, so that the left-hand and right-hand arms of the coil always experience a force in the same direction.
Swaps the contact evert half turn, so that the left-hand and right-hand arms of the coil do not experience a force in the same direction.
Swaps the contact evert half turn, so that the left-hand and right-hand arms of the coil always experience a force in the same direction.
Which of the following is not the source of magnetic field:
Moving charge
Electric current
Magnet
A small piece of iron
Magnetic field is a scalar quantity.
True
False
The magnetic field lines are__________.
open curves
closed loops
straight lines everywhere
Direction of magnetic field produced by a current carrying loop can be found by using
Fleming's Right hand rule
Right hand Thumb rule
Fleming's Left hand rule
Left hand thumb rule
At the centre of which of the following four circular rings the magnetic field is the strongest for equal magnitude of current?
Loop 1
Loop 2
Loop 3
Loop 4
The direction of the force on a current-carrying wire placed in a magnetic field depends on
the direction of the current
the direction of the field
the direction of current as well as field
neither the direction of current nor the direction of field
The magnetic field lines due to a straight wire carrying a current are
straight
circular
parabolic
elliptical
The relative strength of magnetic field is show by
Degree of closeness of field lines
Size of magnetic field
Amount of current flowing
Length of field lines
A magnetic field line is used to find the direction of:
A. South-north
B. A compass needle
C. A bar magnet
D. Magnetic field
2.The magnetic field lines inside a current carrying solenoid, are:
A. Along the axis and parallel to each other
B. Circular, but they do not intersect each other
C. Circular at the ends inside the solenoid
D. All of these
5. Which of the given statements is incorrect regarding magnetic field lines?
A. The direction of magnetic field at a point is taken to be the direction in which the north pole of a magnetic compass needle points .
B. Magnetic field lines are closed curves
C. If magnetic field lines are parallel and equidistant, they represent zero field strength
D. Relative strength of magnetic field is shown by the degree of closeness of the field lines
Assertion: Strength of an electromagnet depends on the magnitude of current flowing through them.
Reason: Electromagnets are majorly used for lifting heavy weights.
Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
Both the Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
Assertion is true and reason is false
Assertion is false and reason is true
Assertion: When the direction of current is perpendicular to the magnetic field, it experience a maximum force.
Reason: Force on the moving charge does not depends on the direction magnetic field in which it moves.
Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
Both the Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
Assertion is false and reason is true
Assertion is true and reason is false
A negatively charged particle projected towards west is deflected towards North by a magnetic field. The direction of magnetic field is:
Towards south
Towards East
Downward
upward
The magnetic field lines near a long straight wire carrying current are:
Straight lines
Concentric rings
Spiral lines
Radial lines
What is the role of split rings in a electric moter
Convert A.C. into D.C.
Convert D.C. INTO A.C.
Reverse the direction of Current
Increases the current
In fleming's left hand rule the fore finger denotes the direction of _____________
magnetic field
force
current
none of these
Inside the magnet the direction of field lines from its
north pole to south pole
north to north pole
south pole to north pole
south to south pole
Thumb and first finger represent .......
magnetic field, force
force, current
force, magnetic field
current, force
The diagram show the direction of magnetic field,B and current, I.
By using Fleming left hand rules, determine the direction of Magnetic force, F.
no force produced
downward
into the page
out from the page
The diagram show the direction of magnetic field,B and current, I. (Current is going inside the screen)
By using Fleming left hand rules, determine the direction of Magnetic force, F.
no force produced
right
into the page
out from the page
The diagram show the direction of magnetic field,B and current, I. (Current is coming out of the screen)
Determine the direction of Magnetic force, F.
no force produced
right
downward
out from the page
What direction is the conductor moving? (Induced current coming out of the screen)
Up
Down
Which direction is the conductor moving? (Induced current coming out of the screen)
Up
Down
When a conductor is moved through the magnetic field, an _______________ is produced.
induced current
electromotive force
electromagnetic induction
internal resistance
In Fleming's Right Hand Rule, First finger and center finger represent
current, magnetic field
magnetic field, current
force, current
magnetic field, force
