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

Does cph mass increase, Does CPH mass increase? Answer; Never, mass of ...

Does CPH mass increase? Answer; Never, mass of CPH is constant, as like its speed.

Explain power supply voltage, A diode in a circuit similar to the one in Fi...

A diode in a circuit similar to the one in Figure 29-26 has a voltage drop, V d , of  0.95 V when I = 18 mA. If a 390 Ω resistor, R, is connected in series, what power supply volta

Distinguish between diamagnetic and ferromagnetic materials, Distinguish am...

Distinguish among diamagnetic and ferromagnetic materials in respect of their (i) intensity of magnetisation, (ii) behaviour in a non-uniform magnetic field and (iii) susceptibilit

Kirchhoffs law of radiation, Kirchhoff's law of radiation (G.R. Kirchhoff):...

Kirchhoff's law of radiation (G.R. Kirchhoff): The emissivity of a body is equivalent to its absorptance at the simialr temperature. Kirchhoff's laws (G.R. Kirchhoff)

Lab, Imagine a small observer is positioned in front of the cork in your pi...

Imagine a small observer is positioned in front of the cork in your picture above. As the cork approaches, the observer measures the wavelength of the waves passing by. How does th

Magnetic effects of current, i have to make a written project on this topic...

i have to make a written project on this topic please tell me something what should i make

Zero gravity, what will happen if gravity becomes zero?is it possible in ea...

what will happen if gravity becomes zero?is it possible in earth?

Define force, Force: push or pull upon an object resulting from the object...

Force: push or pull upon an object resulting from the object's dealings with another object. Whenever there is an interaction among two objects, there is a force upon every of

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