Asolid nonconducting sphere of radius r carries a uniform charge density throughout its volume. at a radial distance r1 = r/4 from the center, the electric field has a magnitude e0.

what is the magnitude of the electric field at a radial distance r2 = 4r?

a) e0/2

b) 4e0

c) e0

d) e0/4

e) 2e0

In the circuit, the switch s has been open for a long time and r = 125 kohm. it is then suddenly closed. (a) determine the time constant before the switch is closed. s (b) determine the time constant after the switch is closed. _ s (c) let the switch be closed at t = 0. find the current in the switch as a function of time. (use t for time. express your answer in milliamps and seconds.) i(t) =_