using the following diagram, identify which circuit is a series circuit and which is a parallel circuit. which circuit would be best to have for your holiday lights and why

A10nc charge sits at a point in space where the magnitude of the electric field is 1500 n/c. what will the magnitude of the field be if the 10 nc charge is replaced by a 20 nc charge? assume the system is big enough to consider the charges as small test charges.