A point particle with charge Q $=+4\mathrm{.}5\backslash$mu C is fixed in place at

the origin. A line of charge with length L $=2\mathrm{.}0$ m and linear

charge density $\backslash$lambda $=7\mathrm{.}0$ nC$/$m is placed along the x$-$axis, with

its left end a distance d $=12$ cm from the origin. What is the

force F that the line of charge exerts on the point particle?

For the limit check, investigate what happens to F if the line

of charge becomes very short $($i$.$e$.,$ L $->0)$ while everything

else remains fixed. Please provide units in your steps.