1) In figure 1, R is a circular ring of charge having line charge density λ and radius 3cm. Find, in terms of λ, the net electric field at point P which is 15cm away along the axis of the ring.
1) In figure 1, R is a circular ring of charge having line charge density λ and radius 3cm. Find, in terms of
λ, the net electric field at point P which is 15cm away along the axis of the ring.
2) The ring in figure 1 is now replaced by a circular disk having the same radius (3cm) and a constant
surface charge density of δ = +4µC/m 2 . In this new configuration, find the net electrostatic force on a
proton if it is placed at point P.
3) Figure 2 shows two concentric rings of radii R
and R’ = 3R that lie on the same plane. Point N
lies on the central z-axis, at distance D = 2R
from the center of the rings. The smaller ring
has uniformly distributed charge +Q. In terms of
Q, what is the uniformly distributed charge on
the larger ring if the net electric field at N is
zero?
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