Which of the following statements is CORRECT?

• A.charges generated on glass rubbed with silk are called negative
• B.charges in various media can be carried by protons detached from their atom
• C.the magnitude of any charge is a multiple of the charge of an electron
• D.the intensity of an electric field is a scalar quantity
• E.if 500 joules of work are required to move a 2-coulomb charge between two points, the potential difference between the two point is 100V