Answer to Question #194069 in Electricity and Magnetism for Sayed Sajid Hussai

Question

Which of the following is the electromagnetic in origin ?

1) normal force. 2) friction force

3) tension in string

Answer 1

Tension in a string is electomagnetic because as the string extends, atoms and molecules move slightly relative to each other creating magnetic fields and magnetic moments. When two atoms are far apart, the total energy is the summation of energy of individual atoms. However, when they come close to each other the electronic charge distribution changes resulting in magnetic forces.