The emf induced in a coil due to the change of its own flux linked with it is called
Mutually induced emf
Dynamically induced emf
Statically induced emf
Self induced emf
Correct Answer :
D. Self induced emf
Related Questions
An electron- volt (eV) is a unit of
Energy
Potential difference
Charge
Momentum
What determines the atomic number of an element?
The number of protons
The number of electrons
The number of neutrons
The number of neutrons and protons
All matters (gasa liquid and solid) are composed of
Neutrons
Particles
Electrons
Atoms
Ohm's law cannot be applied to which material?
Copper
Silver
Silicon carbide
Aluminum
The magnitude of the induced emf in a coil is directly proportional to the rate of change of flux linkages. This is known as
Joule's Law
Faraday's second law of electromagnetic induction
Faraday's first law of electromagnetic induction
Coulomb's Law
A permanent magnet does not exert a force on
an unmagnetized iron bar
a magnetized iron bar
a moving electric charge
a stationary electric charge
What is the SI unit of conductivity?
Ohms/m
Ohms-m
Siemens-m
Siemens/m
Lenz's law is the consequence of the law of conservation of
Energy
Charge
Field lines
Momentum
The temperature coefficient of resistance of conductors is
positive
zero
negative
infinite
Which of the following has the highest permeability?
Soft iron
Steel
Air
Permalloy
Which of the following materials has the highest dielectric strength?
Glass
Oiled paper
Mica
Air
The magnetic field of a magnetized iron bar when strongly heated
Becomes weaker
Becomes stronger
Reverses in direction
is unchanged
The physical motion resulting from the forces of magnetic fields is called
Motor action
Rotation
Repulsion
Torque action
Germanium atom has ______ protons and ______ electrons.
32, 32
32, 42
42, 32
34, 34
The permittivity of a material is given by one of the following formulas.
DE
E/D
D^2/E
D/E
If the number of valence electrons of an atom is more than 4a the substance is called
a semiconductor
a conductor
an insulator
a semi-insulator
The ability of a material to conduct magnetic flux through it.
Permittivity
Reluctivity
Conductivity
Permeability
Electromotive force in a circuit
causes free electrons to flow
increases the circuit resistance
maintains circuit resistance
is needed to make the circuit complete
One weber of flux is equal to _______ magnetic lines of force.
10^6
10^10
4 × 10^7
10^8
Another term for corona discharge.
Lightning
Sparking
Aurora
Corona Effect
The branch of Engineering which deals with the magnetic effect of electric current is known as
Magnetism
Electromagnetism
Electrical engineering
Electronics engineering
Calculate the flux density that will be produced by the field intensity of 2000 a. t/m for a permeability of 126 x 10^-6 T/A.t/m
0.252 G
0.252 x 10^-2 T
0.252 T
0.252 x 10^-2 G
If a 20 V potential is applied across a relay coil with 50 turns having 1 ? of resistancea the total magnetomotive producing magnetic flux in the circuit is
10 Wb
50 T
1000 A t/m
1000,t
The temperature coefficient of resistance of semiconductors is
positive
zero
negative
infinite
Who discovereda the relationship between magnetism and electricity that serves as the foundation for the theory of electromagnetism?
Luigi Galvani
Hans Christian Oersted
Andre Ampere
Charles Coulomb
The magnetic flux of 2000 lines is how many Maxwells?
Electric lines of force leave or enter the charge surface at an angle of
30o
45 o
90o
depending upon the angle of launch and entry
The unit of electrical energy is
Joule
Watt- second
Kilowatt hour
All of these
The net electrical charge in an isolated system remains constant. This is known as
Law of conservation of charge
Coulomb's first law
Coulomb's second law
Law of conservation of energy
What is the reluctance of a magnetic path having a length of 2x 10^-3m and crosssectional area of 2.5 x 10^-3 m^2?
6366 A, t/Wb
6000 A, t/Wb
8x10^-3 A, t/Wb
0.8 A, t/Wb