A book is placed on a flat horizontal table.The table exerts a normal force on the book.The origin of the normal force in terms of the fundamental forces is
A)gravitational force.
B)electromagnetic force.
C)weak nuclear force
D)strong nuclear force
E)all the four forces

Question

Quizplus · Accepted Answer

The normal force is an electromagnetic force, arising from the repulsion between the electrons in the table and the book. Gravitational force is not involved in this particular scenario, and the weak and strong nuclear forces are not significant on the macroscopic scale of the book and table. Therefore, the best choice is B, electromagnetic force.

A Book Is Placed on a Flat Horizontal Table