How do you solve these Is the magnitude for number one 0 NC

How do you solve these?

Is the magnitude for number one: 0 N/C while E(0,2.0 cm) a vector?

You have 4 equal point charges, say 5 muC, at the 4 corners of a square: (x, y) = (1 cm, 1 cm), (1cm, -1 cm), (-1cm, 1cm) and |(-1 cm, -1cm) What is the electric field at the center of this array of charges Magnitude = Units = Is E(0, 2.0 cm) a vector, a scalar (circle) 2) You place a point charges, of +5.00 muC at y = 20 cm. and a point charge of 5.00 muC at y=-20 cm. What is the electric potential at x=0, y=0? units How much work was done to bring the charges to their current locations, beginning at infinite separation? Is the work + or

Solution

I suppose the answer is required for number one only as per your Query.

SO Magnitude of electric field would be zero. this is because of symmetry there would be euqal and opposite electric field due to each charge which would cancel out.

E(0,2.0) would be a vector which would have resultant electric field along y axis as x component of elctric field would cancel out.