The expression $\left( {\frac{1}{{\sqrt 2 }}\hat i + \frac{1}{{\sqrt 2 }}\hat j} \right)$ is a

  • A

    Unit vector

  • B

    Null vector

  • C

    Vector of magnitude $\sqrt 2 $

  • D

    Scalar

Similar Questions

A vector has a magnitude $x$. If it is rotated by an angle $\theta$, then magnitude of change in vector is $n x$. Match the following two columns.
Colum $I$ Colum $II$
$(A)$ $\theta=60^{\circ}$ $(p)$ $n=\sqrt{3}$
$(B)$ $\theta=90^{\circ}$ $(q)$ $n=1$
$(C)$ $\theta=120^{\circ}$ $(r)$ $n=\sqrt{2}$
$(D)$ $\theta=180^{\circ}$ $(s)$ $n=2$

How can we represent vector quantity ?

State with reasons, whether the following algebraic operations with scalar and vector physical quantities are meaningful :

$(a)$ adding any two scalars,

$(b)$ adding a scalar to a vector of the same dimensions ,

$(c)$ multiplying any vector by any scalar,

$(d)$ multiplying any two scalars,

$(e)$ adding any two vectors,

$(f)$ adding a component of a vector to the same vector.

A particle starting from the origin $(0, 0)$ moves in a straight line in the $(x, y)$ plane. Its coordinates at a later time are $(\sqrt 3 , 3) .$ The path of the particle makes with the $x-$axis an angle of ......... $^o$

  • [AIPMT 2007]

A vector is represented by $3\,\hat i + \hat j + 2\,\hat k$. Its length in $XY$ plane is