Fundamentals of Physics Extended (10th Edition)

Published by Wiley
ISBN 10: 1-11823-072-8
ISBN 13: 978-1-11823-072-5

Chapter 3 - Vectors - Questions - Page 56: 10b


$\vec{D}$ and $\vec{E}$ have negative dot product with $\vec{A}$.

Work Step by Step

Recall the dot product formula: $\vec{a} \cdot \vec{b} = |a| |b| cos\phi$ Since both $\vec{D}$ and $\vec{E}$ have the same length and cosine is negative in the II and III quadrants, $\vec{D}$ and $\vec{E}$ have negative dot product with $\vec{A}$.
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