Problem 1
Consider a circuit which has a 10.0 V battery in series with a 5.0 ohm resistor in series with a 6.0 ohm resistor in series with a parallel combination of a 20.0 ohm , 10.0 ohm resitor, and 5.0 ohm resistor. What is the current through the 10.0 ohm resistor?

Ans. .21A

Problem 2
Four point charges with magnitude 5.0 microcoulumbs are placed at the corners of a square that is 30.0 cm on a side. Two charges, diagonally opposite each other, are positive, and the other two are negative. What are the magnitude and the direction of the force on one of the charges?

Ans. 2.3 N towads the center

Problem 3
A parallel-plate capacitor is made of two 40.0 cm diameter circular plates spaced 1.50 mm apart. How much charge is stored on the capacitor when it is charged to 650 V?

Ans. 4.8 x 10^-7 C

Problem 4
Three point charges are arranged in an equilateral triangle of edge length 1.0 cm. One charge is a -1.0 microcoulumbs (top) and the other two charges are +1.0 microcoulumbs (bottom). What is the electric potential at the midpoint of the edge between the two postive charges?

Ans. 2.6 x 10⁶ V

Problem 5
Four equal point charges of magnitude Q are arranged on the corners of a square of edge length 1.0 cm. Evaluate the electric field at (a) the center and (b) the midpoint of one edge, given that Q = 1.0 x10^-9 C.

Ans. (a) zero, (b) 1.3 x 10⁵ N/C