Electricity and magnetism

11

Mani Pal Singh ·2009-03-14 00:47:57

A magnetic field is a vector field which can exert a magnetic force on moving electric charges and on magnetic dipoles (such as permanent magnets). When placed in a magnetic field, magnetic dipoles tend to align their axes parallel to the magnetic field. Magnetic fields surround and are created by electric currents, magnetic dipoles, and changing electric fields. Magnetic fields also have their own energy, with an energy density proportional to the square of the field intensity.

magnetic field intensity tells about the intensity {strength} of magnetic field

Magnetic flux, represented by the Greek letter Î¦ (phi), is a measure of quantity of magnetism, taking into account the strength and the extent of a magnetic field. The SI unit of magnetic flux is the weber (in derived units: volt-seconds), and the unit of magnetic field is the weber per square meter, or tesla.

mere khyal se H field and magnetic field r the same!!!!!!!!!
Unfortunately, the term magnetic field is used for two separate vector fields which are denoted H and B. Although the term "magnetic field" was historically reserved for , with B being termed the "magnetic induction", B is now understood to be the more fundamental entity. Modern writers vary in their usage of B as the magnetic field.

magnetic flux density yaar yeh woh density of region hota hai hai jis mein surface density par magnetic flux hota hai

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11

Subash ·2009-03-14 01:59:44

magnetic field is a term which cannot be expressed in numbers it just signifies that there is a field in that region

magnetic field intensity defines the strength of the field or lets say can be used to compare to two different fields

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Mani Pal Singh ·2009-03-14 01:24:51

sorry dude 4 confusung u[2][17]

The term 'magnetic field' is also used for the magnetic H field. The magneticH field is used in situations where magnetization is present. Outside of magnetizable materials the H field differs from the B field only by a multiplicative constant. Inside of a magnetic material they can be very different. The H field is defined as:

B=₀Î¼ ( H +M) (SI units)

where M is magnetization density of any magnetic material. In SI units, H is measured in amperes per meter (A/m); in cgs units, it is measured in oersteds (Oe).

dude i am deleting the previous post to avoid confusion