Also, what is the magnetic field outside a solenoid?
The magnetic field lines exist outside the solenoid, but the number of field lines per unit area outside the solenoid is much less compared to the number of lines per unit area inside the solenoid. Hence the magnetic field outside is so feeble that it is considered to be practically zero.
Also Know, why is B zero outside a solenoid? Because although the magnetic field is stronger inside the solenoid (because the shape of the solenoid reinforces it) the current flowing through the coil generates a magnetic field outside too and it is not cancelled completely, thus B is non-zero outside the solenoid.
Also to know, is the magnetic field outside a solenoid zero?
Magnetic field outside a long solenoid can never be zero. Because a solenoid of finite length will have edges and field will come out. However, if we imagine a straigth solenoid of infonite length or a toroid, it will not have edges from where lines of force can come out.
Does the magnetic field outside solenoid depend on the distance from the solenoid?
The magnetic field inside the solenoid does not depend on the diameter of the solenoid. The magnetic field only depends on the current running through the solenoid and the number of turns per unit length.
