The component of a vector `vec(r)` along x- axis will have a maximum value if

Options

A. `vec(r )` acts along positive Y-axis.
B. `vec(r )` acts along positive X-axis.
C. `vec(r )` acts along negative Y-axis.
D. `vec(r )` acts at an angle of 45° with X-axis.

Answer

D

Explanation

Here component of `vec(r)` along X-axis will be `vec(r)` cos `theta` which is maximum when cos `theta` is maximum i.e. `cos theta = 0°` or `vec(r)` is acting along X-axis is the +ve direction.