c Not secure l www. Res t?pos 28idep- 17915135 Extension Queston Total 020 2.04

Question

c Not secure l www. Res t?pos 28idep- 17915135 Extension Queston Total 020 2.04 011440s Points Chapter 15 4 and 15 5 a charged disk and a cap o These produce unom electric Seldh and are very practical For tes assigment you strnt mme by andon purs The mmbi Assignment Scoring Your best submission for each question part is used for your score If the magnitude of the electric Seld in air exceeds roughly 3 and minus) that can be placed on the a spark 1of NC, the air breaks down and a spark forms. For a two-disk capacitor of radius 53 cm with a gap of 1 mm, what is the maxdmunm hr 10" NC·the air breaks down and a spark fons. For a two-disk capacitor of radius 53 on with a what is the maxdmum charge (plus that can be placed on the disks without a spark forming (which would permit charge to flow from one disk to the other)? secton 155

Explanation / Answer

Electric field E   = 3 *106 N/ C  

radius r = 53 cm

Area of the circular disk  is A = r 2

                                               = ( 53 * 10-2 m) 2

                                                = 0.88 m2

   seperated distance d = 1 mm

                                    = 1 *10-3 m

Capacitance of the Capacitor C = e0 A / d

                                                = 8.85 *10-12 * 0.88 m2 / 1 *10-3 m

                                                 = 7.78 *10-9 F

      Potential difference V = E * d

                                        = 3 *106 N/ C   * 1 *10-3 m

                                         = 3*10 3 V

maximum charge Q = C V

                                 = 7.78 *10-9 F * 3*103 V

                                = 23.3 *10-6 C

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