20.2 Magnetic Field
The Magnetic field and its intensity B
This concept is similar to the electrostatic field. Hence = is also analogous to .
The S.I. unit of pole- strength is 1 Ampere - meter and that of B is 1 newton/ Ampere - meter which
is also called 1 weber/ m2 or 1 Tesla.
Bar Magnets and Dipole Moments
![](p4.gif)
Intensity on the Axis
![](p5.gif)
Direction of therefore is same as that of
![](p8.gif)
Intensity on the Equator
![](p9.gif)
The direction of is opposite to that of .
![](p10.gif)
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