WorksheetsMagnetic effect of Current
Total questions: 35
Worksheet time: 48mins
In Flemings Left Hand Rule, in what direction does the middle finger point?
The direction of movement
The direction of the magnetic field
The direction of electrical current
The direction of electron flow
The phenomenon of generating an electric current from the motion of a conductor in a magnetic field is called
conduction.
electromagnetic induction.
motion.
magnetism.
What is the principle of electric generator?
A current carrying conductor placen in a magnetic field experience a force
Electromagnetic induction
Right hand thumb rule
Fleming's left hand Rule
What electric motor is a device which converts
electrical energy to light energy
electrical energy to heat energy
electrical energy to sound energy
electrical energy to mechanical energy
Name the rule to find the direction of magnetic field around a current carrying conductor.
Fleming's right hand rule
Fleming's Left hand rule
Right hand thumb rule
Left hand thumb rule
What is the significance of Oersted's experiment?
A current carrying conductor experiences a force
A current carrying conductor produces a magnetic field
Magnetic needle produces current
Magnetic field producess current
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
In the same direction as the magnetic field
The most important safety method used for protecting home
appliances from short circuiting or overloading is
earthing
use of fuse
use of stabilizers
use of electric meter
To convert an AC generator into DC generator
split-ring type commutator must be used
slip rings and brushes must be used
a stronger magnetic field has to be used
a rectangular wire loop has to be used
The strength of magnetic field inside a long current carrying
straight solenoid is
more at the ends than at the centre
minimum in the middle
same at all points
found to increase from one end to the other
A constant current flows in a horizontal wire in the plane of the paper from east to west as shown in Figure. The direction of magnetic field at a point will be North to South
directly above the wire
directly below the wire
at a point located in the plane of the paper, on the north side
of the wire
at a point located in the plane of the paper, on the south
side of the wire
Choose the incorrect statement
Fleming’s right-hand rule is a simple rule to know the direction
of induced current
The right-hand thumb rule is used to find the direction of
magnetic fields due to current carrying conductors
The difference between the direct and alternating currents is
that the direct current always flows in one direction, whereas
the alternating current reverses its direction periodically
In India, the AC changes direction after every 1/50 second.
In the arrangement shown in Figure 13.4 there are
two coils wound on a non-conducting cylindrical rod.
Initially the key is not inserted. Then the key is
inserted and later removed. Then
the deflection in the galvanometer remains zero throughout
there is a momentary deflection in the galvanometer but it dies out shortly and there is no effect when the key is removed
there are momentary galvanometer deflections that die out shortly; the deflections are in the same direction
there are momentary galvanometer deflections that die out shortly; the deflections are in opposite directions
A uniform magnetic field exists in the plane of paper pointing from left to right as shown in Figure. In the field an electron and a proton move as shown. The electron and the proton experience
forces both pointing into the plane of paper
forces both pointing out of the plane of paper
forces pointing into the plane of paper and out of the plane of paper, respectively
force pointing opposite and along the direction of the uniform magnetic field respectively
Choose the incorrect statement from the following regarding magnetic lines of field
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
Magnetic field lines are closed curves
If magnetic field lines are parallel and equidistant, they represent zero field strength
Relative strength of magnetic field is shown by the degree of closeness of the field lines
What component protects the appliance from overloading which could start a fire?
Earth Wire
Neutral Wire
live wire
Fuse
battery
What property of fuse wire enables it to act as a safety feature?
its Boiling point
its strength
its Melting point
its Texture
its flexibility
What component protects the user of appliances from any leakage current?
Earth Wire
Neutral Wire
live wire
Fuse
battery
Frequency of AC in India is 50Hz. How many times does AC change its direction in one second
50
100
1/50
1/100
Name the instrument that can detect the presence of a current in a circuit.
Voltmeter
Ammeter
Galvanometer
Battery
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.
The phenomenon of electromagnetic induction is
the process of charging a body.
the process of generating magnetic field due to a current passing
through a coil.
producing induced current in a coil due to relative motion between a
magnet and the coil.
the process of rotating a coil of an electric motor.
The device used for producing electric current is called a
generator.
galvanometer.
ammeter.
motor.
The essential difference between an AC generator and a DC generator is that
AC generator has an electromagnet while a DC generator has
permanent magnet.
DC generator will generate a higher voltage.
AC generator will generate a higher voltage.
AC generator has slip rings while the DC generator has a commutator.
At the time of short circuit, the current in the circuit
reduces substantially.
does not change.
increases heavily.
vary continuously.
