# What is So Special About the Combination E/M? Why Do We Not Simply Talk of E and M Separately? - Physics

What is so special about the combination e/m? Why do we not simply talk of and separately?

#### Solution

The basic relations for electric field and magnetic field are  (eV = 1/2 mv^2) and (eBv = (mv^2)/r) respectively

These relations include e (electric charge), v (velocity), m (mass), V (potential), r(radius), and B (magnetic field). These relations give the value of velocity of an electron as (v = sqrt(2v(e/m)) and (v = Br (e/m)) respectively

Concept: Photoelectric Effect and Wave Theory of Light
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#### APPEARS IN

NCERT Class 12 Physics Textbook
Chapter 11 Dual Nature of Radiation and Matter
Q 37.2 | Page 411