1.

The component of a vector vec(r ) along X-axis will have maximum value only if:

Answer»

`vec(R )` acts ALONG positive Y-axis.
`vec(r )` acts along positive X-axis.
`vec(r )` acts along NEGATIVE Y-axis.
`vec(r )` acts at an angle of 45° with X-axis.

Solution :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.


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