(a) Find the electric potential at points a and b for charges of +4.9 nC and -7.
ID: 2270748 • Letter: #
Question
(a) Find the electric potential at points a and b for charges of +4.9 nC and -7.7 nC located as shown in the figure.Va = V Vb = V
(b) What is the potential difference ?V for a trip from a to b?
V
(c) How much work must be done by an external agent to move a point charge of +1.50 nC from a to b?
J Va = V Vb = V Va = V Vb = V Find the electric potential at points a and b for charges of +4.9 nC and -7.7 nC located as shown in the figure. What is the potential difference ?V for a trip from a to b? V How much work must be done by an external agent to move a point charge of +1.50 nC from a to b?
Explanation / Answer
a) Va=kq1/x1 + kq2/x2
=9*10^9*(4.9/0.06 - 7.7/0.159)*10^-9
=299.151 V
Vb=kq1/x1 + kq2/x2
=9*10^9*(4.9/0.12 - 7.7/0.12)*10^-9
=-210 V
b) Vb-Va=-210-299.151
= -509.151 V
c)work done= dV*q
=-1.5*10^-9*509.151
=-7.637*10^-7 J
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