The magnitude of the resultant of two equal vectors is equal to the magnitude of either vector. What is the angle between the two vectors?
A
60∘
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
90∘
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
120∘
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D
150∘
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution
The correct option is C120∘ R2=A2+B2+2ABcosθ. It is given that R=A=B. Putting these values we have A2=A2+A2+2A2cosθ
or cosθ=−12 which gives θ=120∘
Hence the correct choice is (c)