6
(P) Two point charges are
placed at a distance of 8.0 ´
10-3 m apart as shown in the diagram.
(a)
On the diagram, show the complete electric field you would expect
to see.
(3)
PPP
(b)
What is the force acting between the two points? What can you say about
the force? (3)
F
= 9 ´
109 ´
+ 1.6 ´
10-19 ´
- 1.6 ´
10-19
(P)
= - 3.6 ´
10-24 N (P)
(8.0 ´
10-3 )2
The
force is attractive (P)
(c)
What is the value of the electric field strength at the midpoint between
the charges? (2)
E
= 9 ´
109 ´
2 ´
1.6 ´
10-19
(P)
= 1.8 ´
10-4 NC-1(P)
(4.0 ´
10-3 )2