Question

If  a and b are two vectors of the same magnitude inclined at an angle of 60° such that  a.b= 8, write the value of their magnitude.

Answer 1

Given,

θ  = 60° and \(|\vec a|=|\vec b|\)

= 8

\(|\vec a|^2=16\)

\(|\vec a|=4\) (as magnitude cannot be negative)