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four particles with charges +5x10^6C, +3x10^6, +3x10^6C, and +5x10^6C are placed at the corners of a 2m x 2m square. (a)determine the electric potential at the center of the square, assuming zero potential at infinity. (answer:3.83x10^4V)(b) … 
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1.Which of the following is greater than 4.3x10^9 A)2.1x10^9 B)3.2x10^9 C)5.3x10^9 D)7.4x10^8*** 2.Which of the following are less than 6.5x10^5? 
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( 7.5x10^11 )  ( 4.3x10^8 ) 
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5x10^2=5x100=500. 3x10^3=3x100=300.