A long uniform line of charge (like a charged length of wire) has an electric field strength of 870 N/C at a distance from 0.315 m from the line. How much charge is present in a section of the line length 2.40 cm

measuring things 1 litre of water

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.

inverse v=i*r

nice nice