Q. 15

# For two vectors A and B, |A + B|= |A – B| is always true whenA. |A| |B| ≠ 0B. A ⊥ BC. |A| = |B| ≠ 0 and A and B are parallel or anti parallelD. When either |A| or |B| is zero

It is given that , it could be true when |A|=0 or |B|=0 or both are zero.

The given statement can also be true if both conditions are applied together that is

or

Therefore we can write,

This gives the always true condition that is when A is perpendicular to B.

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