Question

For two vectors A and B, A+B = A-B is always true when

(a) |A| = |B |≠ 0

(b) A ⟂ B

(c) |A |= |B| ≠ 0 and A and B are parallel or anti parallel

(d) when either |A | or |B| or is zero.

Answer 1

(b) A ⟂ B

(d) when either |A | or |B| or is zero.