Transcript Electric field

For the charge distributions shown on
the spherical conductors below, which
field lines are most reasonable?
+
+
+
+
-
+
+
+
-
-
+
-
-
+
+
+
(a)
+
+
+
+
(c)
-
-
(b)
-
+
+
+
- -
+
+
+
- -
-
+
+
+
+
-
+
+
+
(d)
-
-
An electric charge of +1.0x106 C is spread
uniformly over one side of a styrofoam sheet
by rubbing it with fur.
Which of the following best represents the
field lines near the sheet?
a)
b)
c)
d) None of the above
Which of the vectors best represents
the electric field experienced at
point P?
Q1
Metal
plate
(a)
(b)
(c)
(d)
P
q2
(e) None of the above
The negative particle in the figure below
is shot from the positive plate with a low
velocity. Which dotted trajectory is most
reasonable?
(a)
(b)
(d)
(e)
(c)
In the figure below, a metal slab is
placed in an external electric field

Eext
a
Eext
Eint
b
1. The electric field Eint inside the metal is
(a) 0
(b)  Eext (c)  Eext
(d)  Eext

(e) Eext
2. The answer in (1) is true because
(a) the electrons inside the metal move
 until
 they
no longer experience a force, and F  qE
(b) electric fields cannot penetrate a metal
(c) there is zero net charge in the metal