A4 microc charge is situated at the origin of an xy coordinate system what is the potential difference between the points x=4m and y = 2m.

options are
a. -9 x 10^3 v
b. 9 x 10^3 v
c. -36 x 10^3 v
d. 27 x 10^3 v

i already know the answer, i need the work ! answer is b, i know because i guessed. i'm not giving /brainiest if you just say "b"

An unknown substance has a melting point of 1064 ∘c, is insoluble in water, conducts electricity as a solid, and is hard. given these properties, which of the following are possible identities for the unknown substance? check all that apply. view available hint(s) check all that apply. sio2 f2 au kbr

If a star is moving toward earth, it is

Point charges q1=+2.00μc and q2=−2.00μc are placed at adjacent corners of a square for which the length of each side is 1.50 cm . point a is at the center of the square, and point b is at the empty corner closest to q2. take the electric potential to be zero at a distance far from both charges. part a what is the electric potential at point a due to q1 and q2? express your answer with the appropriate units.