Question

the vector sum of three vectors a,b and c is zero. If i and j are unit vectors in the direction of a and b respectively then c is along ????​

Answer 1

Given:

The vector sum of three vectors a,b and c is zero.

To Find:

Direction of C.

Solution:

Given,

Vector a is along i direction.

Therefore,

• a = ai

Vector b is along j direction.

Therefore,

• b = bj

Given sum of vectors, a, b, c is 0.

Therefore,

• a + b + c = 0
• c = - ( a + b )
• c = - ( ai + bj )
• c = $\frac{1}{\sqrt{a^{2}+ b^{2} } }$ ( a ( - i ) + b ( - j ) )
• Therefore, c is in - i - j direction.

Therefore, C  is along - i - j.

Answer 2

Answer:

he is right

hope it helps you to u