Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Materials with 'hard' magnetic B/H characteristics often show a strong residual magnetism. This makes them suitable for making permanent magnets. If the ring material were magnetised, then the magnetised material itself will create a flux in the ring. No current carrying coil will be required.
For a permanent magnet, flux is produced by the alignment of magnetised domains within the material itself. (c.f earlier notes relating to residual magnetism in B/H curve). In this case, the flux exists without the need for a coil, i.e. N.I = 0. Hence applying Ampere's Law results in:
Hence eqn 1 and the B/H curve must be simultaneously satisfied and to give the flux density and magnetic field strength in the magnetic material (and hence also the air gap)
from equation (1) Bc/Hc=-Lc/Lgµ0
which is slope of a straight line. The flux density and magnetic field in the magnetic circuit is given by the point at which eqn (1) cuts the B/H curve. Permanent magnets are widely used in transducers:- loud speakers, measuring meters, D.C. motors etc.
Q. What do you mean by Superposition and linearity? Mathematically a function is said to be linear if it satisfies two properties: homogeneity (proportionality or scaling) and
ELECTRO MAGNETISM: In this unit we learned about electromagnetism and the relationship that presents between and magnetic flux and electric current. The way in which electric
Explain temperature dependence of electrical conductivity and resistivity in conductors. When the temperature is increased, there is a greater thermal motion in atoms that redu
Q. Find the output voltage in terms of the input voltage? In order to illustrate the insensitivity of feedback circuits to variations of the op-amp parameters, let us consider
area bounded by the curve y=3x(x-2)^2 and the x-axis
Q. Explain various functions of telephone switching systems. Ans: Functions of telephone switching systems are: (i) Attending: The system should be continually monito
Surge Current It is the maximum admissible peak value of a sinusoidal half cycle of 10 ms duration at a frequency of 50Hz. The value is specified at a given junction tem
Q. Different kinds of high-tension fuses and low-tension fuses ? Ans: There are two kinds of fuses they are a) L.V Fuses - 1) HRC cartridge fuses. - 2) Semi enclosed re
Consider the filter h[n,m] describing the input-output relationship below: g[n,m]=f[n-1,m]+ f[n,m-1]+ f[n+1,m]+ f[n,m+1] a) What is the impulse response of this filter? b
A three-phase, wye-connected, cylindrical-rotor synchronous generator rated at 10 kVA and 230 V has a synchronous reactance of 1.5per phase and an armature resistance of 0.5 pe
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd