Question

The component of a vector r along X-axis will have maximum value
if

• A. r is along positive Y-axis
• B. r is along positive X-axis
• C. r makes an angle of 45° with the X-axis
• D. r is along negative Y-axis

Answer 1

The correct option is B r is along positive X-axis

The component of a vector r along X-axis will have maximum value when r is along positive axis because the angle between r and x-axis is 0°. Hence cosine will have maximum value equal to 1.

Therefore Rcos0°= R