Physics XII Content





Magnatic field lines and magnatic flux

The direction of magnatic field lines at any point can be given by the magnatic needle. Actually, the direction of magnatic field and magnatic field lines are not in same direction. So, magnatic lines of force are rather called magnatic field line.
Magnatic field lines and magnatic flux
Similar to the electric field we can also define the magnatic flux in magnatic field.
The magnetic flux at any area can be defined as magnetic field lines crossing per unit area. It is denoted by
Magnatic field lines and magnatic flux

Again magnatic flux passing through any small elementary area is
Magnatic field lines and magnatic flux

total flux passing through  is
Magnatic field lines and magnatic flux

if magnatic field is uniformly distributed then Magnatic field lines and magnatic flux
the unit of B is Tesla (T) and area is m2. The unit of Φ is Tm2. it is also called Wber, which is named after German physicist Willium Wber.

Now
Magnatic field lines and magnatic flux



so the magnetic field can be defined as the magnatic flux per unit area. It is also called magnatic flux density. Its unit is Wbm‑2. So, 1T = 1 Wbm‑2

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