Question

Differentiate between magnetic flux and magnetic flux density

Answer 1

Magnetic flux is the number of lines of induction(or lines of magnetic force) passing normally thorugh a surface
Whereas
Magnetic flux density is the number of magnetic lines of force per unit area passing through a very small surface held normal to the lines is called the magnetic flux density at that point.

Answer 2

magnetic flux is the number of field lines passing throug an area...
flux = magnetic field. area =B.A= BAcos@
Some special cases:-----
1 ) when magnetic field lines crossing the area perpendicular to area direction so ...angle is 90..then cos90= 0..so flux is zero..
2).when magnetic field lines is along the direction of area..so angle =0..then ..cos0= 1..so flux =BA cos0= BA..
3).When magnetic field lines is opposite to the direction of area...then angle is 180...so cos180 = --1....thne flux =BAcos180 = --BA...
.
MAGNETIC FLUX density is the number of magnetic field lines passing through a unit area....

..I think this is sufficient to help u...