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Physics
Physics
Problem
The moment of the couple formed by the forces
5
i
^
+
k
^
5\hat{i} + \hat{k}
5
i
^
+
k
^
and
−
5
i
^
−
k
^
-5\hat{i} - \hat{k}
−
5
i
^
−
k
^
acting at the points
(
9
,
−
1
,
2
)
(9, -1, 2)
(
9
,
−
1
,
2
)
and
(
3
,
−
2
,
1
)
(3, -2, 1)
(
3
,
−
2
,
1
)
respectively, is a.
−
i
^
+
j
^
+
5
k
^
-\hat{i} + \hat{j} + 5\hat{k}
−
i
^
+
j
^
+
5
k
^
b.
i
^
−
j
^
−
5
k
^
\hat{i} - \hat{j} - 5\hat{k}
i
^
−
j
^
−
5
k
^
c.
2
i
^
−
2
j
^
−
10
k
^
2\hat{i} - 2\hat{j} - 10\hat{k}
2
i
^
−
2
j
^
−
10
k
^
d.
−
2
i
^
+
2
j
^
+
10
k
^
-2\hat{i} + 2\hat{j} + 10\hat{k}
−
2
i
^
+
2
j
^
+
10
k
^
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