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A spherical rubber balloon carries a total charge Q = 0.02 ?C uniformly distributed on its...

A spherical rubber balloon carries a total charge Q = 0.02 ?C uniformly distributed on its surface. At t = 0, the nonconducting balloon has radius r0 = 2.9 cm and the balloon is then slowly blown up so that r increases linearly to 2r0 in a time T = 16 s.

a. Determine the magnitude |E| of the electric field at r = 4.35 cm at time t = 4 s.

b. Determine the magnitude |E| of the electric field at r = 4.35 cm at time t = 12 s.

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