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.

The plum pudding model of the atom states that ?

In order of decreasing light-transmitting capabilities of materials, which is the correct sequence? a. transparent -> translucent -> opaque b. opaque -> transparent -> translucent c. opaque -> translucent -> transparent d. translucent -> transparent -> opaque

The discovery of the electron as a subatomic particle was a result of