(a) A physics lab instructor is working on a new demonstration. She attaches two identical copper balls with mass m = 0.180 g to cords of length L as shown in the figure. A Both balls have the same charge of 7.60 nC, and are in static equilibrium when 8 = 5.15°. What is L (in m)? Assume the cords are massless. m (b) What If? The charge on both balls is increased until each cord makes an angle of 8 = 10.30 with the vertical. If both balls have the same electric charge, what is the charge (in nC) on each ball in this case? nC

(a) A physics lab instructor is working on a new demonstration. She attaches two identical copper balls with mass m = 0.180 g to cords of length L as shown in the figure. A Both balls have the same charge of 7.60 nC, and are in static equilibrium when 8 = 5.15°. What is L (in m)? Assume the cords are massless. m (b) What If? The charge on both balls is increased until each cord makes an angle of 8 = 10.30 with the vertical. If both balls have the same electric charge, what is the charge (in nC) on each ball in this case? nC