The magnetic circuit, Physics

Assignment Help:

THE MAGNETIC CIRCUIT

In an electric circuit, a current is established due to the existence of an electromotive force. In the same way, in a magnetic circuit, a flux is established due to the existence of a magnetomotive force. The mmf is produced by the current flowing in the coil and its value is the product of the current and the number of turns on the coil.

Magnetomotive Force = Current x Number of Turns on the Coil

Note that, although mmf is quoted in ampere turns, the actual unit dimension is in amperes.

MAGNETISING FORCE

The magnetomotive force can be expressed in terms of the length of the magnet. It is then referred to as the magnetising force or magnetic field strength and given the symbol H. The magnetising force is a measure of the intensity of the magnetic effects at any given point in the magnetic field.

Magnetising Force (H) = Magnetomotive Force / Length of magnet

Note that:

• The unit of field strength is ampere per metre, although it may be quoted as ampere turns per metre.
• The length of a solenoid ‘l', is the length along its axis and not the length of wire from which the solenoid is made.

It will therefore be seen that a solenoid having 10 turns per metre carrying a current of 6A (10* 6 = 60 ampere/metre) will produce the same strength of magnetic field as one of 12 turns per metre carrying 5A (12 *5 = 60 ampere/metre).


Related Discussions:- The magnetic circuit

What is convection, Although conduction does occur in liquids and gases als...

Although conduction does occur in liquids and gases also, heat is transmitting in these media mostly by convection. In that phenomenon, the real motion of the material is responsib

What are the design constraints of slide emitting optics, What are the desi...

What are the design constraints of slide emitting optics? The genuine illuminance of side emitting optics is low, while the luminance is quite acceptable in many cases. This m

Special features and applications of carbon dioxide laser, What are the Spe...

What are the Special features and Applications of carbon dioxide laser? Special features and Applications of carbon dioxide laser: The efficiency of this Laser is extremely

Magnetism, what is the magnetic field at a distance l from the centre of th...

what is the magnetic field at a distance l from the centre of the circle of radius r which carries a current i

How is energy transformed in windmills, How is energy transformed in windmi...

How is energy transformed in windmills? Essentially what occurs is that as the energy from the wind rotates the vanes of the mill, coils of wire move inside a permanent magnet

Determine and plot for 5 kev to 100 mev fraction, Determine and plot for 5 ...

Determine and plot for 5 keV to 100 MeV the fraction of the total cross section due to each of the four interaction processes for (a) hydrogen, (b) nitrogen, (c) aluminum,

Explain the steps to the scientific notation, Q. Explain the steps to the s...

Q. Explain the steps to the scientific notation? Answer:- To write in scientific notation you must first move the decimal point of the number to where the number is betwee

Aluminium, Aluminium   Atomic number 13 ...

Aluminium   Atomic number 13 Symbol Al Atomic weight 26.98154 Discovery W

Nicols prism, give full detail of nicols prism about 20 to 30 pages

give full detail of nicols prism about 20 to 30 pages

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

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!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd