A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but reason is not the correct explanation of the assertion.
C) If assertion is true but reason is false.
D) If the assertion and reason both are false.
E) If assertion is false but reason is true.
Correct Answer: C
Solution :
If two vectors equal in magnitude are in opposite direction, then their sum will be a null vector. A null vector has direction which is intermediate (or depends on direction of initial vectors) even its magnitude is zero.
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