8.02X Electricity and Magnetism

)q− = k ⇒ q= k × × × =−15cm−1 31200 1.2 10 0.15 20nCc) No, because the amount of net charge on the balloon is very small.Problem 6 (5 Points): Young + Freedman, Problem 23.61a) Using the result from 23.57, we have3V( ) ab1 50×10 14E r = = × = 9.71×10 V/m−22ln ( b/ a)r ⎛14×10 ⎞ 7×10ln ⎜ 90 10−4⎟⎝ × ⎠b)4 −6 −3× × q = × × × × ⇒9.71 10 V/m 10 30 10 9.8 10q = ×−113 10 C4