Problem 5:
Four point charges It], Q, -2Q, and Q form a
square with sides of length L as shown in the
Figure. What is the magnitude of the resulting
electrostatic force on the charge :1 due to the
other three charges?
Answer: 0.41KquL2
Solution: The elect

Problem 18:
A point charge H is located at the
center of a solid spherical conducting
shell with inner radius of R and outer
radius ofER as shown in the Figure. In
addition, the conducting shell has a total
net charge of +1). Hotsr n1uch charge is
located

Problem 16:
A solid insulating sphere of radius Rhas a charge +Q
distributed uniformly throughout its volume (the
volume charge density p is constant). The insulating
sphere is surrounded by a solid spherical conductor
with inner radius R and outer radius

Homework
1. A lightning strike might typically be associated with a current of 200, 000A and have a duration
of 0.2s . How much charge is delivered in the strike? How many electrons (assuming they are
the primary charge carriers) would it contain?
2. In t