Published by:
CGP EDU Academic Team
Published on: August 13, 2026
If
and
, has magnitude
, then
is equal to:
Text Solution
Verified by ExpertsThe correct answer is:
A
JEE Main 2019



… (i)
Since, it is given that 
Then, form equation (i)

Now, square on both side, we get

Since, it is given that a > 0 
Then, 

Hence, 
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