I need help with 31 and 34 please?

FIGURE P20.29 FIGURE P20.30 at the 30. I| What are the strength and direction of the electric field at C, is at the position indicated by the dot in Figure P20.307 Specify the d direc- direction as an angle above or below horizontal. Section 20.5 The Electric Field from Arrangements of Charges 31. J A parallel-plate capacitor is constructed of two square plates, field as size L X L, separated by distance d. The plates are given charge + Q. Let's consider how the electric field changes if one of these of the variables is changed while the others are held constant. What is charge the ratio Ef/E; of the final electric field strength Er to the initial electric field strength E, if: eld at a a. Q is doubled? b. L is doubled? transfer c. d is doubled? 0 sense 32. II Use what you know about drawing in field electric field lines to sketch the electric ense to field of a quadrupole, two positive and ether or two negative charges arranged as in in their Figure P20.32. a quick 33. II A parallel-plate capacitor is formed wers. If from two 4.0 cm X 4.0 cm electrodes FIGURE P20.32 ference spaced 2.0 mm apart. The electric field strength inside the -40 pC capacitor is 1.0 X 10" N/C. What is the charge (in nC) on each electrode? 2.0 cm 34. | Two identical closely spaced circular disks form a parallel- plate capacitor. Transferring 1.5 x 10" electrons from one disk fields to the other causes the electric field strength between them to conclu be 1.0 X 10' N/C. What are the diameters of the disks? ould a another Section 20.6 Conductors and Electric Fields Irge of 35. | A parallel-plate capacitor is constructed of two horizontal tect its 12.0-em-diameter circular plates. A 1.0 g plastic bead, with a charge of -6.0 nC. is suspended between the two plates by the 1.0 mm force of the electric field between them. a. Which plate, the upper or the lower