Home
Class 12
PHYSICS
If |overset(rarr)A-overset(rarr)B|=|over...

If `|overset(rarr)A-overset(rarr)B|=|overset(rarr)A|-|overset(rarr)B|` the angle between `overset(rarr)A` and `overset(rarr)B` is

A

`60^(@)`

B

`0^(@)`

C

`120^(@)`

D

`90^(@)`

Text Solution

Verified by Experts

The correct Answer is:
b
Squaring both side `rarrb |barA|^(2)+|barB|^(2)-2|barA||barB|cos theta =|A|^(2)+|B|^(2)-2|barA||barB| rarr cos theta =1 rarr theta=theta^(0)`
Promotional Banner

Similar Questions

Explore conceptually related problems

If |overset(rarr)A+overset(rarr)B|=|overset(rarr)A-overset(rarr)B| what is the angle between overset(rarr)A and overset(rarr)B ?

Let overset(rarr)C = overset(rarr)A+overset(rarr)B then :

If overset(rarr)A+overset(rarr)B+overset(rarr)C =0 and A = B + C, the angle between overset(rarr)A and overset(rarr)B is :

The maqunitudes of vecotr overset(rarrA), overset(rarr)B and overset(rarr)C are respectively 12,5 and 13 units and overset(rarr)A+overset(rarr)B=overset(rarr)C then the angle between overset(rarr)A and overset(rarr)B is :

If overset(rarr)A=overset(rarr)B+overset(rarr)C and the magnitude of overset(rarr)A, overset(rarr)B and overset(rarr)C are 5,4 and 3 units respectively the angle between overset(rarr)A and overset(rarr)C is

Projection of overset(rarr)P on overset(rarr)Q is :

If overset(rarr)B=noverset(rarr)A and overset(rarr)A is antiparallel with overset(rarr)B , then n is :

Prove that |overset(rarr)a-overset(b)|ge||overset(rarr)a|-|overset(rarr)b|| When does the equally holds?