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 are the majority carriers in p-type semiconductor, In p-type semicondu...

In p-type semiconductor the majority carriers are (A) Holes. (B) Positive ions. (c) Electrons. (D) Negative ions. Ans: In p-type semiconductor the majori

Lambert''s laws, Lambert's laws (J.H. Lambert): Lambert's first law ...

Lambert's laws (J.H. Lambert): Lambert's first law The illuminance on a surface illuminated through light falling onto it perpendicularly from a point source is propor

Velocity, initial acceleration rocket is 0.01t in upward dirction initioal ...

initial acceleration rocket is 0.01t in upward dirction initioal velocity is 50ms-1 , what is the function for the velocity of the rocket?

Manufacturing of resistors , The following steps are taken in the manufactu...

The following steps are taken in the manufacturing of a resistor: (1)         PREPARATION OF SUBSTRATE: Substrate should hold the resistive element. It should be a good insula

Polarization, Explanation construction and working of Nicol prism?

Explanation construction and working of Nicol prism?

Illustrate what is a positron, Illustrate what is a positron? Answer:-...

Illustrate what is a positron? Answer:- A positron is a positively charged electron and it's an anti-electron - antimatter! The positron has a charge of +1 just the opposi

Describe the secondary emission in pentode, Explain how suppressor grid eli...

Explain how suppressor grid eliminates effect of secondary emission in pentode Ans: Suppressor grid is placed in between plate and screen grid. It's connected with the cathode

Expermient of a metal ring stand and rings, A metal ring stand and rings ...

A metal ring stand and rings A useful ring stand and rings can be made from a flat curtain rod and the fixtures which clamp over electric bulbs to hold lamp shades. These are u

Describe process for realization of plane polarized light, Briefly explain ...

Briefly explain how elliptically and circularly polarized light is generated. Describe the process for realization of plane polarized light from elliptically polarized light.

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