R - Galileo and Einstein
R - Galileo and Einstein
R - Galileo and Einstein
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Field on Axis from Two Opposite Charges<br />
• This is a dipole: the analysis is just like the two equal charges case:<br />
y-axis<br />
x-axis<br />
Q<br />
d<br />
d<br />
-Q<br />
R<br />
r<br />
<br />
P<br />
<br />
E<br />
kQrˆ<br />
<br />
r<br />
E<br />
upper charge 2<br />
total<br />
• Anywhere on the axis, the field is downward, <strong>and</strong> has value<br />
E<br />
2kQ 2kQd 2kQd 2kQd<br />
sin<br />
<br />
r 2 r 3 R<br />
R<br />
3<br />
<br />
2 2<br />
R d 3/2
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