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46. A vector of zero magnitude which has no direction associated with it is ^called (A) Unit Vector (B) Null Vector (C) Polar Vector (D) none of these |
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Answer» null vectorExplanation:Zero Vector or null vector is a vector which has zero magnitude and an arbitrary direction. It is represented by 0 Ԧ . If a vector is multiplied by zero, the result is a zero vector. If a Ԧ = −b → , then a Ԧ +b Ԧ = 0 Ԧ It is important to note that we cannot take the above result to be a number, the result has to be a vector and here lies the importance of the zero or null vector. The physical meaning of 0 Ԧ can be understood from the following examples. The position vector of the ORIGIN of the coordinate axes is a zero vector. The displacement of a stationary PARTICLE from time t to time tl is zero. The displacement of a ball thrown up and received back by the thrower is a zero vector. The VELOCITY vector of a stationary BODY is a zero vector. The acceleration vector of a body in UNIFORM motion is a zero vector. |
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