11.5 In the diagram you see the spark gap between
the contacts of an automobile spark plug.
When the contacts are charged to a potential
difference great enough to cause a spark to
jump across the gap, the electric field between
them approximates a uniform field of strength
3.1×10^6 N/C. What is the magnitude of the
potential difference that causes the spark?
V11.6 An important factor in many biochemical cell processes is the potential difference across a cell membrane. The inside of a
cell is at a lower electric potential than the outside, with a potential difference of 0.080 V between them. The membrane
consists of two layers of chainlike lipid molecules packed together like the blades of grass in a lawn, but it is only 7.5 nm thick.
What is the strength of the electric field inside the membrane?
N/C
11.7 A uniform field has strength 66.8 N/C and points in the positive x direction in three-dimensional space. The electric potential
at the point (2.50 m, 0 m, 0 m) is í17.3 V. (a) What is the shape of the equipotential surfaces for this field? (b) Write an
equation to describe the set of points for which the electric potential is zero volts. (c) Write an equation to describe the set of
points for which the electric potential is +24.8 V.
(a) Spheres
Planes parallel to the xy plane
Planes parallel to the yz plane
Planes parallel to the xz plane
(b) x = 0 m
z = 0 m
x = 2.24 m
x = 2.50 m
x = 2.78 m
(c) x = 2.48 m
y = 2.48 m
z = 2.48 m
x = 1.87 m
x = 2.50 m(^456) Copyright 2007 Kinetic Books Co. Chapter 24 Problems