4.2 Electromagnetism

Question 1

When you want to determine the direction of the magnetic field around a single conducting wire.

Answer 1

Put your thumb in the direction of the electron flow, and your fingers will curl in the direction of the magnetic field around the conducting wire.

Question 2

When you want to determine the direction of the magnetic field in the core of a solenoid.

Answer 2

Put your fingers in the direction of the electron flow and your thumb will point to the North in the core of the solenoid.