The vector sum of three vectors` vecA, vecB` and `vecC` is zero . If `hati` and `hatj` are the unit vectores in the vectors in the directions of `vecA` and `vecB` respectively , them :

Options

A. `vecC` is in the plane of `hati` of `hatj`
B. `vecC` is along `hati xx hatj`
C. `vecC` is along `hati`
D. `vecC` is along`hatj`

Answer

A

Explanation

`vecA + vecB + vecC=0`
`hati` is unit vector in direction of `vecA` and `hatj` is unit vectors in direction of `vecB` if `vecA + vecB + vecC =0` then `vecC` is in the plane of `hati` and `hatj`