A diagram of a closed circuit with power source on the left labeled 45 V, two resistors on the top labeled 2.0 Ohms and 3.0 Ohms, a resistor on the right labeled 4.0 Ohms and a resistor on the bottom labeled 6.0 Ohms.
What is the equivalent resistance in this circuit?

Ω

What is the current in this circuit?

A

Students in an introductory physics lab are performing an experiment with a parallel-plate capacitor made of two circular aluminum plates, each 11 cm in diameter, separated by 1.0 cm. how much charge can be added to each of the plates before a spark jumps between the two plates? for such flat electrodes, assume that value of 3×106n/c of the field causes a spark.