In this question, a statement of assertion 
is followed by a statement of reason 
. Mark
the correct choice as:
Assertion: A null vector is a vector whose magnitude is zero and direction is arbitrary.
Reason: A null vector does not exist.
Text Solution
Verified by ExpertsC
: If two vectors are equal in magnitude but are in opposite direction, then their sum will be a
null vector. A null vector is defined as a vector having zero magnitude. Its direction is defined as being arbitrary. The concept of a vector with arbitrary directional specification is a debatable mathematical issue. But in the mathematical theory of vectors the notation 
mentions only components not directions. So 
and is defined to have zero component in every direction.
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