Three charges 6µC, 2µC and 2μC are placed respectively at the three sides of an equilateral triangle ABC of side 8cm. Find the force on a charge 3μC placed at the centre of the triangle.
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Answer:
→ The vertical components of force cancel out as the magnitude of charges are equal.
Net force experience by A is
F
net
=
(0⋅1)
2
k(200×10
−6
)(5×10
−6
)
×Cos(60
0
)+
(0⋅1)
2
k(200×10
−6
)(5×10
−6
)
(Cos60)
=
10
−2
(9×10
9
)(200×10
−6
)(5×10
−6
)
=9×20×5
F
net
=900N(
x
^
)
solution
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