Related Questions
What is the correct answer?
4
Which of the following is a natural magnet?
What is the correct answer?
4
If the relative permittivity of a material is 10a then its permittivity is
What is the correct answer?
4
The relative permeability of a magnetic material is 10^5. What is its permeability?
What is the correct answer?
4
One of the common application of an air- cored choke.
What is the correct answer?
4
One ampere- turn is equivalent to _____ gilberts
What is the correct answer?
4
One that has magnetic poles produced by internal atomic structure with no external current necessary
What is the correct answer?
4
An atom or a group of atoms that carries a net electric charge.
What is the correct answer?
4
The point in a magnet where the intensity of magnetic lines of force is maximum
What is the correct answer?
4
Back emf refers to the
A. Current equal to the applied emf
C. Current opposing the applied emf
D. Voltage opposing the applied emf
What is the correct answer?
4
The contribution to the ionization in an ionization chamber by electrons liberated from t he walls.
What is the correct answer?
4
The magnetic flux of 2000 lines is how many Maxwells?
What is the correct answer?
4
The resistivity of a conductor ___________ with an increase in temperature.
What is the correct answer?
4
A magnetic pole produces 5000 field lines. How much is the flux in webers? A. 50 × 10^-6
What is the correct answer?
4
A magnetic flux of 2.5 x10^4 Wb through an area of 5 x10^4 square meters results in
B. 0.5 Tesia of flux density
D. 5000 Tesia of flux density
What is the correct answer?
4
The force between two charges placed a given distance apart ______ as the relative permittivity of the medium is increased.
What is the correct answer?
4
Electric field intensity is a ________.
What is the correct answer?
4
Electron is a Greek word for
What is the correct answer?
4
The reluctance of the magnetic circuit is ________ relative permeability of the material comprising the circuit.
A. directly proportional to
B. inversely proportional to
What is the correct answer?
4
What is the usual value of leakage coefficient for electrical machines?
What is the correct answer?
4
The flux density in an air-cored coil is 10^-3 Wb/m^2. With a cast iron core of relative permeability 100 inserteda the flux density will become
What is the correct answer?
4
The property of magnetic materials of retaining magnetism after withdrawal of the magnetizing force is known as
What is the correct answer?
4
A positively charged body has
What is the correct answer?
4
A law that states that the polarity of the induced voltage will oppose the change in magnetic flux causing the induction.
What is the correct answer?
4
One electron volt (1 eV) is equivalent to _____ joules
What is the correct answer?
4
The simplest type of atom to exist is the ______ atom.
What is the correct answer?
4
If a magnetic flux cuts across 200 turns at a rate of 2Wb/sa the induced voltage according to Faraday's law is about
What is the correct answer?
4
The phenomenon by which a magnetic substance becomes a magnet when it is place near a magnet
D. Electromagnetic induction
What is the correct answer?
4
The space outside the magnet where its pole have a force of attraction or repulsion on a magnetic pole is called
What is the correct answer?
4
Who discovereda the relationship between magnetism and electricity that serves as the foundation for the theory of electromagnetism?
B. Hans Christian Oersted
What is the correct answer?
4
The electric potential at a point in air due to a charge is 21 V. If the air is replaced by a medium of relative permittivity of 3a then electric potential at that point will be