An inductor (l), a resistor (r), a battery (v), and a switch are all connected in a single loop series circuit. immediately after the switch is closed,
a. the current in the circuit is l/r.
b. the current in the circuit is zero because the inductor resists the change in its current state.
c. the current in the circuit is v/r.
d. the current in the circuit is zero because the circuit contains a resistor.

Four objects each with charge +2.0×10−7c are located at the corners of a square whose sides are 2.0 m long. part a what quantities can be determined using this information? check all that apply. the electric force on a charged object placed at the center of the square. the mass of each object. the total electric potential energy of the system consisting of the four charged objects. part b find the electric force on a charged object placed at the center of the square.