Hawkins Electrical Guide v. 01 (of 10) / Questions, Answers, & Illustrations, A progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications

by N. Hawkins

Since a solenoid carrying a current attracts and repels by its extremities the poles of a magnet, two such solenoids will attract and repel each other.

Ques. How does the magnetic strength of a solenoid vary?

Ans. It is proportional to the strength of the electric current passing through it.

Ques. On what, besides the current strength, does the magnetizing power of a solenoid depend?

Ans. The magnetic effect or the magnetizing power is proportional to the number of turns of wire composing the coil.

Ques. How may the magnetizing power of a solenoid be increased?

Ans. By inserting in the solenoid an iron core or round bar of soft iron.

Ques. Describe the action of an iron core.