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Physics
Physics
Problem
An electric dipole of moment
p
⃗
=
(
i
^
−
3
j
^
+
2
k
^
)
×
10
−
29
C
⋅
m
\vec{p} = (\hat{i} - 3\hat{j} + 2\hat{k}) \times 10^{-29} \text{ C}\cdot\text{m}
p
=
(
i
^
−
3
j
^
+
2
k
^
)
×
1
0
−
29
C
⋅
m
is at the origin
(
0
,
0
,
0
)
(0, 0, 0)
(
0
,
0
,
0
)
. The electric field due to this dipole at
r
⃗
=
+
i
^
+
3
j
^
+
5
k
^
\vec{r} = +\hat{i} + 3\hat{j} + 5\hat{k}
r
=
+
i
^
+
3
j
^
+
5
k
^
(note that
r
⃗
⋅
p
⃗
=
0
\vec{r} \cdot \vec{p} = 0
r
⋅
p
=
0
) is parallel to: a.
(
+
i
^
−
3
j
^
−
2
k
^
)
(+\hat{i} - 3\hat{j} - 2\hat{k})
(
+
i
^
−
3
j
^
−
2
k
^
)
b.
(
−
i
^
+
3
j
^
−
2
k
^
)
(-\hat{i} + 3\hat{j} - 2\hat{k})
(
−
i
^
+
3
j
^
−
2
k
^
)
c.
(
+
i
^
+
3
j
^
−
2
k
^
)
(+\hat{i} + 3\hat{j} - 2\hat{k})
(
+
i
^
+
3
j
^
−
2
k
^
)
d.
(
−
i
^
−
3
j
^
+
2
k
^
)
(-\hat{i} - 3\hat{j} + 2\hat{k})
(
−
i
^
−
3
j
^
+
2
k
^
)
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