MIME-Version: 1.0 Content-Type: multipart/related; boundary="----=_NextPart_01C4F80D.78611C70" This document is a Web archive file. If you are seeing this message, this means your browser or editor doesn't support Web archive files. For more information on the Web archive format, go to http://officeupdate.microsoft.com/office/webarchive.htm ------=_NextPart_01C4F80D.78611C70 Content-Location: file:///C:/0D7649F1/SkipSection1.htm Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="us-ascii"
Page 4
Checkpoint
A
charge of
is positioned 5 m away from a charge of
. Find the force acting on each of the charges. (Ans:
N where the negative sign shows that the force is attract=
ive)
Use
, where Q =3D
, q =3D
, eo =3D 8.85 x 10-=
12
C2m-2
Page 10
Ch=
eckpoint

=
a)&n=
bsp;
Calculate the electric potential at=
A, 3.0 m away from a point charge of +1.0 mC.
=
&nb=
sp; =

=
b)&n=
bsp;
Calculate the electric potential at=
B, 6.0
m away from the same charge of + 1.0 mC.
&=
nbsp; &nbs=
p; &=
nbsp; 
=
c)&n=
bsp;
How much work would be done in movi=
ng a
+0.2 =
mC
charge from A to B?
=
&nb=
sp; =
Work
done by external agent
=
&nb=
sp; =

=
&nb=
sp; =
i.e. charge loses its electric potential energy when it
moves from A to B.
=
d)&n=
bsp;
How much work would be done by an
external agent in moving a unit positive charge from infinity to point A?
By
definition, the work done by external agent in moving unit positive charge =
from
infinity to point A is the potential due to charge
at point A.=
&=
nbsp; &nbs=
p; &=
nbsp; 
Prepared by: =
Mr Nick Chan, NJC 2005