Question

It says magnetic flux density is 0.9 w/msquared. What doz it mean?

Answer 1

Magnetic flux is the amount of magnetic field lines that pass perpendicular a surface of an area.

Magnetic flux is the average amount of magnetic field lines that pass a surface per unit area.

Magnetic flux is measured in T m^2 or Wb.

Magnetic flux density is Wb/m^2

Answer 2

A straight conducting rod of length 0.4m is moving perpendicular to a magnetic flux density of 0.9 w/m2 with a speed of 7 m/s. The emf developed in the rod is

Answer 3

\[|E|=vBL=(7\frac{m}{s})(0.9\frac{Wb}{m^{2}})(0.4m)=2.52V\]

Answer 4

thnx

Answer 5

@Festinger Please explain, how did you work through the problem and got the answer. Just using the formula and giving out the answer won't help the user.

Answer 6

It is an experimental fact that
\[E=\frac{-d\Phi_{b}}{dt}\]
and x is the direction which the wire moves. it follows that speed is v.
L is the length of the wire.
B is the magnetic flux per unit area. It stays constant throughout.
\[\frac{-d\Phi_{b}}{dt}=\frac{B\:dA}{dt}=\frac{BL\:dx}{dt}=BLv\]

Answer 7

I left out the minus sign, but it doesn't really matter in this case.

Answer 8

wts dΦb? Flux density?

Answer 9

\[\Phi_{b}\]
is magnetic flux.

\[\frac{\Phi_{b}}{A}=B\] is magnetic flux density.

\[\Phi_{b}=B*A\]
B is magnetic field or magnetic flux density.

Answer 10

ok. now i get the differentiation