Question

As shown in the figure, a proton is at the origin and an unknown charge is at x = +4.0 nm. If the net electric force on a small positive test charge is zero at x = -3 nm, what is the magnitude and sign of the unknown charge? test charge q unknown charge Q proton x=-3 nm x=0 x=+4 nm 0 +0.19e 0 -0.19e 0 +5.4e 0 -5.4e 0 -2.7e

Answer 1

Sol" :- q Proton Unknown charge 8 x=+qhm x=0 X=-3hm repulsive » The force ie between q & proton is K. qe Fqe ² o (-30m) 2 It is clear that het electric fone at a will be zero if nature force between Q & of 8 is tve. Thus should be attractive. & q 10 For = k. Qq (Inm] 2 Thus Fqe = Faq kq e k qq (72 =) (-3)? e - → 7 09 49 9 19 = +5.4 e The value of a is tha qe