Q22. The S.I. unit of electric field intensity is: O NC-1 O NC O N1C O None of the above

of the average electric field that could accelerar to a speed of 1,0 x 10' m/s. Ignore any relainist effects (Chapter 26) and determine the magnitude tor is 4.0 m long and must accelerate protons from red killing the malignant cells. Suppose a proton acceler ton therapy in which proton beams are accelerated o high energies, then directed to collide into a ru 56. + e Some forms of cancer can be treated using pr these protons

Which of these expressions gives the magnitude of the work done in moving a 4.00 nC charge through a potential difference of 15.0 volts in SI units?   a. 0.004 x 15   b. 15.0 eV   c. 4.00 eV   d. 4 x 15   e. 4.00 x 10-9 x 15

2. A +4.0µC charge starts at a distance of 45cm from a -7.5µC charge. By how much does the potential energy of this system change when the +4.0μC charge moves closer, until this is 23cm away? Include the right sign (positive for an increase, or negative for a decrease). energy as it is the s +4.0pC ㅏㅏ -7.5µC 23cm 45cm