- Electricity and Magnetism (^77)
3.12•. The thickness of a flat sheet of a met-
al foil is d, and its area is S. A charge q
is located at a distance (^1) from the centre of
the sheet such that d< VE <1.
Determine the force F with which the
sheet is attracted to the charge q, assuming
that the straight line connecting the charge
to the centre of the sheet is perpendicular
to the surface of the sheet.
A
2\N C 2
8 z
Fig. 78 Fig. 79
3.13. Where must a current source be con-
nected to the circuit shown in Fig. 79 in
order to charge all the six capacitors having
equal capacitances?
3.14. A parallel-plate capacitor is filled by
a dielectric whose permittivity varies with
the applied voltage according to the law
e = all, where a = 1 V-1. The same (but
containing no dielectric) capacitor charged
to a voltage U 0 = 1.56 V is connected in
parallel to the first "nonlinear" uncharged
capacitor.
Determine the final voltage U across the
capacitors.
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