Chapter 1, Problem 1.25DQ

(a)

To determine

For $\overrightarrow{A}\cdot \overrightarrow{B}=0$ condition $A=0$ and $B=0$ will follow or not.

(b)

To determine

For $\overrightarrow{A}\times \overrightarrow{B}=0$ condition $A=0$ and $B=0$ will follow or not.