1) In the figure on the right, there are two charged objects: a
sphere of radius 1.0 m, with its centre in origin and a long rod
in the direction of z-axis going through the point (0,2,0) (in
meters). The sphere has a homogenously distributed charge
1.5 nC and the rod has a linear charge density 3.0 nC/m.
Determine electric flux density at point P (2,2,0).
2) Example (d) in section 16.8 of the book shows the derivation of the flux density of a thin
homogenously charged ring (radius $R$, charge $Q$) in the symmetry axis of the ring at distance $x$
from the centre of the ring
a) At which distance $x$ the electric field strength gets is maximum, and give the mathematical
expression to this field strength.
b) Calculate the field strength for $R = 20$ pm and $Q = 1e$.