WorksheetsEdulearn.in class 10 magnetic effects Test
Total questions: 70
Worksheet time: 2hrs 20mins
Who was the first to observe the magnetic effect of electric current?
Faraday
Oersted
Volta
Ampere
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
Magnetic field inside a long solenoid carrying current is
same at all points (uniform)
different at poles and at the centre
zero
different at all points
The magnetic field lines due to a straight wire carrying a current are
straight
circular
parabolic
elliptical
If current is passed in a spring with a weight hung on it, then the spring
will be compressed
will expand
compression and expansion both will occur
no change in the state of the spring
A straight wire of length 0.5m and carrying current 1.2A is placed in uniform magnetic field of induction 2T, applied perpendicular to the length of the wire. The force on the wire is
2.4 N
1.2 N
3.0 N
2.0 N
If a long copper rod carries a direct current, the magnetic field associated with the current will be
only inside the rod
only outside the rod
both inside and outside the rod
neither inside nor outside the rod
The magnetic field inside a long straight solenoid carry
ing current is
Zero
decreases as we move towards its end
increases as we move towards its end
the same at all points
Which of the following property of Proton can change while it moves freely in a magnetic field?
mass
speed
velocity & momentum
momentum
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
Fleming left hand rule gives the direction of:
Magnetic field
Current
Induced Current
Motion (Force)
Fleming right hand rule gives the direction of :
Force
Current
Induced current
Magnetic field
Fuse wire has high melting point. True or False:
True
False
May be false
May be correct
Which of the following is the source of direct current:
Car battery
Car alternator
Power house generator
Bicycle dinemo
A rectangular coil copper wires is rotated in a magnetic field. The direction of the induced current changes once in each:
Two revolution
One revolution
Half revolution
One-forth revolution
The magnetic field lines near a long straight wire carrying current are:
Straight lines
Concentric rings
Spiral lines
Radial lines
The device used for producing current is called a:
Galvanometer
Ammeter
Motor
Generator
Name the device which converts mechanical energy into electric energy
Motor
Generator
Heater
Transformer
Which of the following is not the source of magnetic field:
Moving charge
Electric current
Magnet
A small piece of iron
The direction of magnetic field lines inside the magnet are:
From North to south
From south to north
From North to North
From South to South
Magnetic field is maximum:
At Two Poles
At one pole
At The center of the magnet
Outside the magnet
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
Force experienced by a current carrying conductor placed in a magnetic field is
Perpendicular to its length
Perpendicular to its magnetic field
Perpendicular to its length & magnetic field
Perpendicular to its width
According to right hand thumb rule the direction of magnetic field in a current carrying straight conductor is denoted by:
Thumb
Curl fingers
Middle finger
First finger
Who discovered Magnetic Effect of Current:
Faraday
Fleming
Newton
Oersted
According to right hand thumb rule the direction of magnetic field in a current carrying circular coil is denoted by
Thumb
Middle finger
Curl finger
First finger
Magnetic field is a scalar quantity.
True
False
The magnetic field lines are__________.
curves
closed loops
lines
No two field-lines are found to cross each other.
False
True
Magnetic field produced around a straight conductor due to current in it is given by
Fleming's right hand rule
Right hand thumb rule
Clock rule
Fleming's left hand rule
Direction of magnetic field produced by a current carrying loop can be found by using
Fleming's Right hand rule
Clock Rule
Fleming's Left hand rule
Maxwell's corkscrew rule
Which of the following correctly describes the magnetic field near a long straight wire?
The field consists of straight lines perpendicular to the wire.
The field consists of straight lines parallel to the wire.
The field consists of radial lines originating from the wire.
The field consists of concentric circles centred on the wire.
A freely suspended bar magnet always rest in N-S direction
True
False
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
A straight wire carrying a current of 10A is bent into a semi circular arc of the radius π cm as shown in the fig. What is the magnitude and the direction of the magnetic field at the centre O of the arc ?
10-4 T normal to the plane of the arc and directed in to the page
10-4 T normal to the plane of the arc and directed out side the page
2×10-4 T parallel to the plane of the arc and directed towards the left
2×10-4T parallel to the plane of the arc and directed towards the right
A horizontal overhead power line carries a current of 90A in the east to west direction .What is the magnitude and the direction of the magnetic field due to the current 1.5 m below the line ?
0.6 ×10-5 T towards north
0.6 ×10-5 T towards south
1.2 ×10-5 T towards north
1.2 ×10-5 T towards south
A experimenter investigates the variation of the force F between the long , parallel current carrying conductors a distance d apart .A straight –line graph should be obtained on plotting
F against d
F against d1
F against d21
log |F| against d
A semicircular wire of radius r , carrying a current I, is placed in a magnetic field of the magnitude B .The force acting on it
can never be zero
can have the maximum magnitude 2BIr
can have the maximum magnitude BIπr
can have the maximum magnitude Bir
The resulting magnetic field at the point O due to the current carrying wire shown in the figure
Points vertically upwards
Points vertically downwards
is zero
Can not be determined
An electron having a charge e moves with a velocity v in the x -direction. An electric field acts on it in y- direction. The force on the electron acts in
Positive direction of the y - axis
Negative direction of the y - axis
Positive direction of the x – axis
Negative direction of the x - axis
Through two parallel wires A & B , 10 and 2 ampere of the currents are passed respectively in opposite direction. If the wire A is infinitely long and the length of the wire B is 2m. the force on the conductor B which is situated at 10 cm distance from A will be
8×10-6 N
8×10-5 N
4×10-5 N
4×10-5 N
A length of the wire carries a steady current. It is bent first to form a circular plane coil of one turn .The same length is now bent more sharply to give a double loop of the smaller radius .The magnetic field at the center caused by the same current is
A quarter of its first value
Un altered
Four times its first value
A half of its first value
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
An Electric charge in a uniform motion produces
An Electric Field only
An Magnetic field only
Both Electric Field & Magnetic field
Neither of them
Soft iron core
Easily magnetised and demagnetised
Difficult to be magnetised and demagnetised
Steel core
Easily magnetised and demagnetised
Hard to be magnetised and demagnetised
Soft iron core suitable to become temporary magnet ( electromagnetism)
True
False
Magnetic field is a region where magnetic materials experience force
True
False
Electromagnet is a temporary magnet produce when a wire coils around soft iron core
True
False
To increase magnetic field around the electromagnet ...
Increase the current
Decrease number of coils
Coil around soft iron core
U- shaped magnet bar
U-shaped iron core is more suitable than straight iron core because
Straight iron core easily magnetised and demagnetised
U-shaped has stronger magnetic field
Diagram shows a current flows into a coil.
Which of the following magnetic field around the wire is correct ?
Diagram shows 2 compass L and M to determine the direction of magnetic field around the straight conductor.
Which direction is correct direction for compass L and M?
L : P
M : R
L : S
M : P
L : Q
M : R
L : P
M : S
Diagram shows magnetic field between two North poles.
Which region has a greatest strenght of magnetic field?
A
B
C
D
Which is correct pole fir X and Y region?
X : North
Y : South
X : South
Y : North
What is your inference from the diagram
Strength of magnetic field depend on current
Strength of magnetic field depend on number of coils
Strengh of magnetic field depend on type of core
Application of electromagnet can be used in
Relay switch
Electric bell
Telephone earpiece
Circuit breaker
Application of electromagnet can be used in
Relay switch
Electric bell
Telephone earpiece
Circuit breaker
Magnetic effect of current was discovered by
Oersted
Faraday
Bohr
Ampere
Inside the magnet, the field lines moves
from north to south
from south the north
away from south pole
away from north pole
Relative strength of magnetic field at a point in the space surrounding the magnet is shown by the
resistance offered by the surroundings
degree of closeness of the field.
thickness of magnet
length of magnet
By which instrument, the presence of magnetic field be determined?
Voltmeter
Voltmeter
Magnetic Needle
Ammeter
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 direction parallel to the wire
The strength of magnetic field around a current carrying conductor is
inversely proportional to the current but directly proportional to the square of the distance from wire.
directly proportional to the current and inversely proportional to the distance from wire.
directly proportional to the distance and inversely proportional to the current
directly proportional to the current but inversely proportional the square of the distance from wire.
A soft iron bar is introduced inside the current carrying solenoid. The magnetic field inside the solenoid
will decrease
will remains same
will increase
will become zero
The condition for the Phenomenon of electromagnetic induction is that there must be a relative motion between
the galvanometer and magnet
the galvanometer and magnet
the coil of wire and magnet
the magnet and galvanometer
Overloading is due to
Insulation of wire is damaged
fault in the appliances
accidental hike in supply voltage
All of the above
Fleming’s left hand and Right hand rules are used in
Generator and electric motor
Electric motor and generator
any rule can be used for any device
both are not applied for generator and motor.
