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

500,000,000 ÷ 10⁸ = 5 volts.

4. A decrease in the number of magnetic lines which pass through a circuit induces a current around the circuit in the positive direction.

The term positive direction is understood to be the direction along which a free N pole would tend to move.

5. An increase in the number of magnetic lines which pass through a circuit induces a current in the negative direction around the circuit.

The reason for the change of direction of the current for decrease or increase in the number of lines cut, as stated in the fourth and fifth laws, will be seen by aid of the formula given under the second law, viz:

electromotive force = (n - n′)/t (1)

but by Ohm’s law

Substituting (1) in (2)