Prior to this, the circuit was equilibrated for 1500 steps with the switch open, so the electric field is almost zero everywhere inside the wires.
(the circuit; was equilibrated; for 1500 steps with the switch open; T:Prior to this) (the electric field; is; almost zero everywhere inside the wires)
the circuit the electric field
was equilibrated is
for 1500 steps with the switch open T:Prior to this
almost zero everywhere inside the wires