What is the electric potential at the point indicated with the dot in (Figure 1)?
Express your answer in volts.
Potential at given point due to point charge =kQ/r
Potential at a point due to multiple point charges =kQ1/r1+kQ2/r2 +kQ3/r3.......etc
From the figure
as all the charges are equal
r1 = 3cm =0.03m
r3 = 4cm =0.04m
Q= 2nC= 2*10-9C
k=9*109Nm2/C2
,
which is the required solution
If any doubt feel free to comment
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here,
q = 2 nC = 2 * 10^-9 C
r1 = 3 cm = 0.03 m
r2 = 4 cm = 0.04 m
the electric potential at the dot , V = K * q /r1 + K * q /r2 + K * q /sqrt(r1^2 + r2^2)
V = 9 * 10^9 * 2 * 10^-9 * ( 1/0.03 + 1/0.04 + 1/sqrt(0.03^2 + 0.04^2)) V
V = 2297.9 V
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