Three charged particles having charges q, -2q & q are placed in a line at points (-a, 0), (0, 0) & (a, 0) respectively. The expression for electric potential at P(r, 0) for r > > a is
14πϵ0qa2r4
14πϵ08qa2r
14πϵ02qa2r3
14πϵ04qa2r2
A
14πϵ02qa2r3
B
14πϵ08qa2r
C
14πϵ0qa2r4
D
14πϵ04qa2r2
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Solution
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Electric potential is given by, V=kqr, where k=14πϵ0
Total electric potential at point P, V=kqr−a+k(−2q)r+kqr+a
V=kq(r−a+r+ar2−a2−2r)
V=kq(2rr2−a2−2r)
V=kq(2r2−2r2+2a2r(r2−a2))
V=kq(2a2r(r2−a2))
Since, a<<r⟹a2<<<r2,
V=2kqa2r3
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