Published by:
CGP EDU Academic Team
Published on: August 13, 2026
For three unit vectors 
satisfying 
and 
, the positive value of k is
Text Solution
Verified by ExpertsThe correct answer is:
C
Expanding 
with unit vectors gives 
.
So 
.
For the symmetric case where vectors are equally spaced (e.g., on a circle at 
intervals), we have
.
Expanding 
gives 
.
Substituting the symmetric values: 
, which simplifies to 
.
Factoring: 
, giving 
as the positive solution.
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