Question

What does \[2l\] represent for a solenoid whose centre is at \[O\]?

Options

• Radius of solenoid

• Total length of solenoid

• Distance of observation point \[P\] on the axis

• Number of turns per unit length

Answer 1

The total length of the solenoid is \[2l\], with its centre at \[O\]. Its ends are therefore at \[x=-l\] and \[x=+l\].