Three point charges 2°C, ouC and 2uc are placed at the three corners of an equilateral triangle of
side 3 cm. Another point charge luC is placed at the centroid also. Then net electric force acting on
the luc charge will be
A) 90N
B) 160N
C) 240 N
D) 360 N
Answers
Answered by
0
Explanation:
Three point charges 2°C, ouC and 2uc are placed at the three corners of an equilateral triangle of
side 3 cm. Another point charge luC is placed at the centroid also. Then net electric force acting on
the luc charge will be
A) 90N
B) 160N
C) 240 N
D) 360 N
Answered by
0
Answer:
Correct option is
B
99×10
9
Work done on the system is change in their potential energies in two configuration.
q
1
=1C
q
2
=2C
q
3
=3C
So initial potential energy of arrangement
r=1m
U=h(
r
q
1
q
2
+
r
q
2
q
3
+
r
q
3
q
1
)[h is constant 9×10
9
]
=h(
1
2+6+3
)
U
initial
=11h→(1)
Initial potential energy of arrangement r=0.5m
U
final
=h(
r
q
1
q
2
+
r
q
2
q
3
+
r
q
3
q
1
)
=h(
0.5
2+6+3
)
=22h→(2)
Work done=U
final
−U
initial
=22h−11h
=11×9×10
9
=99×10
9
J
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