I know that moving conductor in magnetic field will cause current to flow in that conductor.But what happens if the conductor is moving perfectly straight,parallel to the direction of magnetic field,its cruising along the lines.
Will that cause current to flow too? I saw video about induction that says cutting the magnetic lines causes the current flow,does that mean not cutting the line,going alongside them,will no induce current?
Hello,
The current that flows depends not only on the field strength but also on the orientation of the field and the movement relative to the wire.
Because it depends also on the orientation, there is a certain orientation that will cause maximum current flow and another orientation that will not cause any current flow. Mathematically this is obtained from what is known as the "Cross Product".
The cross product produces a value like any multiplication, but it also produces a direction. If the direction is not along the wire length then there will not be maximum current, and if the direction turns out to be perpendicular, there will be zero current.
There is even a possibility that there will be current flow across the diameter of the wire rather than along the length but that's not usually considered too often with the direction along the wire being the direction most focused on for most problems.
To find out how this works, you'd have to look up the cross product and maybe a little vector algebra. The vectors make it possible to state problems not only in terms of amplitude, but also in terms of direction and that is needed because magnetic fields have orientation which is synonymous with direction.
If you dont want to do that, then just realize that if you have a wire laying flat on a wood table and a moving field and you rotate the orientation of the wire like the hand of a clock as the field is moving past it (or along it) you will see the current go up and down as you rotate the wire. It will go up to some maximum and down to zero, and then reverse maximum and back down to zero. The field needs to keep moving though relative to the wire. Of course this assumes a closed path for the wire so current can flow, so you'd need a return path that is far enough away from the field to not be affected much or else you'd have to take that into account too.