Published by:
CGP EDU Academic Team
Published on: August 26, 2026
The resultant of two vectors 
and 
is 
. If 
is doubled then the new resultant vector is perpendicular to ' 
'. Then R is equal to:
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Let the angle between 
and 
is 
then:
By the parallelogram law
………. (i)
When 
is doubled, the new resultant is 
, which is perpendicular to 
Now,
The above equation multiply with 
…………… (ii)
From equation (i) and (ii)
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