Question

The magnetic field inside a tightly wound, long solenoid is B = µ0 ni. It suggests that the field does not depend on the total length of the solenoid, and hence if we add more loops at the ends of a solenoid the field should not increase. Explain qualitatively why the extra-added loops do not have a considerable effect on the field inside the solenoid.

Answer 1

Explanation:

• Due to an extended solenoid, the magnetic field is shown as B = µ0ni, where the number of loops per unit length is denoted as n.
• Hence, to the solenoid’s ends, if we include extra loops, then we can observe an increase in the loops quantity along with the rise in the length, because of which the ratio n will stay unvaried, thus resulting in not creating a considerable effect on the field within the solenoid.