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WorksheetsMagnetic effects of current
Total questions: 60
Worksheet time: 39mins
Who was the first to observe the magnetic effect of electric current?
Faraday
Oersted
Volta
Ampere
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
Two particles X and Y having equal charges, and accelerated through same potential and enters the uniform magnetic field describing circular paths of radii R1 and R2. The ratio of their masses of X and Y is :
(R1 / R2) 1/2
R2 / R1
(R1 / R2) 2
(R1 / R2)
Magnetic field is a scalar quantity.
True
False
The magnetic field lines are__________.
curves
closed loops
lines
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
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
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
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
Hans Christian Oersted, one of the leading scientists of the 19th century, played a crucial role in understanding
magnetism
electricity
electromagnetism
none
identify the scientist?
otherstand
edison
newton
oersted
In which year oersted discovered electromagnetism?
1980
1820
1850
1890
It was accidentally discovered that a compass needle got deflected when magnetic field passed through a metallic wire placed nearby.
true
false
Oersted showed that __________ and
magnetism were related phenomena.
gravitation
magnets
electricity
earth
A compass needle gets deflected when
brought near a bar magnet.
false
true
A compass needle is, in fact, a small _______ magnet.
circular
bar
horse shoe
cylindrical
The magnetic field produced by a given current in the conductor ___________ as the distance from it increases.
decreases
increases
remains same
none
the magnetic field produced around a straight conductor due to current in it is given by
Fleming's right hand rule
right hand thumb rule
Maxwell's corkscrew rule
left hand thumb rule
which of the following is not attracted by a magnet?
steel
cobalt
brass
nickel
The cyclotron frequency of an electron gyrating in a magnetic field of 1 T is :
28 MHz
280 MHz
2.8 GHz
28 GHz
Why does a compass needle point north?
Because it is being attracted to the Magnetic South Pole
Because north is up
Because it is being attracted to the Magnetic North Pole
Because north is down
What is the name of a magnet that stays magnetic only while it touches a permanent magnet, or one that is magnetic for a very short time?
Temporary magnet
Semi-Permanant magnet
Electromagnet
Natural Magnet
The entire region surrounding a magnet is known as the:
Magnetic Domain
Lodestone
A Compass
Magnetic Field
These magnetic domains are:
strongly magnetized
slightly magnetized
unmagnetized
To make this electromagnet stronger you could:
use less wire
have fewer wire coils around the nail
have more wire coils around the nail
use a plastic core
All metals are attracted to magnets
True
False
An example of a natural magnet is:
Iron
Nickel
Lodestone
Neodymium
The inside of an electromagnet consists of:
An iron core
A plastic core
A copper core
An aluminum core
The Right Hand Rule relates the variables:
Current, Magnetic Field and Magnetic Force
Current, Magnetic Field and Electrical Force
Charge on object 1, Charge on object 2 and distance
Magnetic Field, Magnetic Force and Electrical Force
What will happen when these magnets are let go?
The magnets will not move because they are not touching.
The magnets will move closer to each other because the magnetic force will pull them together.
The magnets will move away from each other because the magnets are not touching.
The magnets will move away from each other because the magnet force will push them apart.
The magnetic field lines are__________.
closed curves
open curves
semi circular
A plotting compass is placed near the south pole of a bar magnet. The pointer of the compass:
point away from the south pole
point parallel to the south pole
point towards the south pole
point at right angles to the south pole
The direction of Magnetic lines of forces is from ?
South pole to north pole.
North Pole to South pole
North Pole to middle of the magnet
North Pole to North pole
Magnetic field is the
area around a magnet where its effect can be felt
length of a magnet where its effect can be felt
volume of a magnet where its effect can be felt
The direction of motion of a current carrying conductor can be determined using
Right hand thumb rule
Right hand palm rule
Fleming's right hand rule
Fleming's left hand rule
The magnetic field pattern assosiated with a straight current carrying conductor is in the form of
parallel lines
perpendicular lines
concentric circles
What must flow through a solenoid for it to produce a magnetic field?
heat
oil
water
electric current
In what direction will the north pole of a freely-floating magnet point?
west
south
east
north
Where is Earth's magnetic field the strongest?
poles
equator
mountain tops
ocean floor
Electricity can create magnetism and magnetism can create electricity.
True
False
Magnetic effects are strongest at the center of a magnet.
True
False
Which of the following does not influence the strentgh of electromagnet?
Number of turns of wire
Magnitude of current flow in the wire
Type of core
Material used for insulator of the wire
