00:01
In this problem the magnetic flux through a 50 centimeter long solenoid is given and we have to find out the current through the solenoid.
00:10
So assuming the magnetic field is along the axis of the solenoid, the flux through the solenoid will be equal to number of turns times dot product of area normal and field.
00:26
This is ba cos theta and since magnetic field is along the axis, the area normal will also be along the axis perpendicular to the area.
00:39
So theta is equal to 0 degree because the magnetic field and area normal will be both in the same direction.
00:50
So the magnetic flux is nba.
00:54
From this we get field equal to phi upon na.
00:59
This is the magnetic flux.
01:04
Now we have to find out the current.
01:08
So magnetic field inside a solenoid is equal to mu naught ni.
01:12
Mu naught is a constant...