ASSIGNMENT
PHYSICS II
1. Two parallel plates are 2cm apart and the electric field strenght between them is
1x104N/C. And electron launched at 450 angle from the positive plates. What is
the maximum initial speed V0, the electron can have without hitting the negative
plate.
2. A 10cm diameter plastıc disk is charged uniformly with an extra 1011 electrons.
What is the electric field 1mm above the surface at a point near the center?
3. Figure shows an electric quadropole. It cosist of two dipoles with dipole moments
that are equal in magnitude but opposite in direction. Show that the value of E on
the axis of the quadropole for a point P a distance z from its center ( assume z>> d)
is given by
E=
Q = 2qd 2
3Q
4πε 0 z 4
Where Q is the quadropole moment of the charge distribution
z
d
+q
d
+q
-q -q
-p
P
+p
4. A control particle of charge –q is surrounded by two circular rings of charged
particles, of radii r and R, with R>r What are the magnitude and direction of the
net electrostatic force on the control particle due to order particles.
+4q
-2q
-2q
+2q
-7q
-q
+q
-7q
+q
-2q
-2q
+4q
5. In figure two curved plastic rods,one of charge +q the other chargeof –q ,form a
circle of radius r in an xy plane.The x axis passes through their connecting
points,and the charge is distributed uniformly on both rods.What are the magnitude
and direction of the electric field E produced at P,the center of the circle?
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