Four charge are placed at four corners of a square that as 30cm on each side. Find the potential at the center of the square If (a) the four charges are each +2.0uC and (b) two of the four charges are +2.0uC and two are -2.0uC.

false

explanation:

boats, things on boats luggage are way more heavy then water.

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.

i think the answer is a, hope this : )