Three point charges 0.33*10^-8,0.33*10^-8 ,0.165*10^-8 ate placed at A,B,C corners of a square. Find the electric field at D
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Answer:
Answer
q
A
=8×10
−9
C
q
B
=32×10
−9
C
q
C
=24×10
−9
C
Electric field intensity at D:E
D
=
r
AD
2
kq
A
+
r
BD
2
kq
B
+
r
CD
2
kq
C
where r
AD
is the distance between A and D and so on..
E
D
=k(
r
AD
2
q
A
+
r
BD
2
q
B
+
r
CD
2
q
C
)
=k(
(0.4)
2
8×10
−9
+
2×(0.04)
2
32×10
−9
+
(0.04)
2
24×10
−9
)
=9×10
9
×10
−9
×
(0.04)
2
8
[1+
2
4
+3]
=45000×[6]
=270000N/C
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