ek aur gareed..:P

V=Edx

Using this at x=10

E=100 N/C

The same follows from any value of x.

Now this 120⁰ that U R saying comes from the angle made by the equipotential surfaces with x axis, which U have not shown in the question...[7][2]

it was the Q as it is as it was given in my fren'z assignment...not even a word edited...[11]

and one thing more, plz give solution in a bit detail plz...[1]

E is 90 tho potential surface

yaar yeh 120° with anticlockwise direction ke saath hoga...

will ny1 tel wt to do and how to start solving??????

plz

This is the detailed solution

If the angle made by Equipot surfaces with X axis is 30⁰

Angle made by Field lines with X axis is 120⁰

And from #2

Magnitude of Field is 100N/C