The cockroach periplaneta americana can detect a static electric field of magnitude 8.50 kn/c using their long antennae. if the excess static charge on a cockroach is modeled as point charges located at the end of each antenna, what magnitude of charge q would each antenna possess in order for each antennae to experience a force of magnitude 2.00 μn from the external electric field? calculate q in units of nanocoulombs (nc) .