Langara College
Department of Physics
Physics 1225 - 1
Solution to Quiz 2
r
j
Find the net electric flux of E = 2i + 5 2k through the circle of radius 5 m centered at the origin on
the x-y plane. [10]
z
The net electric flux through the circle is given by
Langara College, Department of Physics
Physics 1225 1
Solution to Test 3
1.
(a) Find the magnetic field of a very thin long wire, positioned along the z-axis, carrying current I
in direction k , using Amperes Law. (b) Two very long wires each carry a curr
Langara College, Department of Physics
Physics 1225-1
Solution to Test # 1
1.
A charged ring of radius R is placed in the x-y plane such that its centre is at the origin. The ring has a
charge density due to its total charge of Q. (a) Using the vector met
Langara College, Department of Physics
Physics 1225 / 1
Solution to Test 2
1.
A capacitor filled with a dielectric of constant has rectangular plates of length a and width b (a and b are
small). The bottom plate is inclined at a small angle as shown in th
Langara College
Department of Physics
Physics 1225
Field of a Line of Charge
Consider a line of charge +Q and length L placed on the x-axis as shown. Find an expression for the
electric field at a point P (0,yP):
Solution:
Choose dq at a general location
Physics 1225, Quiz 2, Spring 2017 NAME Em
lCylinder = RZLAcylindcr = ZRL ER ZRL = ngmde = 4inmide
0
There is,
- very long metal rod of radius a has a total charge per unit length A = Q/L on its surface.
- a very long (transparent) plastic shell from R =
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Alternative Method for Calculating Field of Infinite Charged Plane
Use an infinite charged line of charge density parallel to x-axis to find the electric field of an
infinite charged plane with charge density :
z
P (0,0,z)
r
r = z2 + y2
z
dq
dy
y
y
x
Infi
Langara College
Department of Physics
Physics 1225 - 1
Solution to Quiz 1
1.
y
Find the net electric field (vector) at point P. [15]
- q (-a,0)
B
r
k (+ q ) r k ( q ) r k ( q ) r
Enet =
r1 +
r2 +
r3
r13
r23
r33
+q (0,a)
A
r
r1
r
r2
x
r
r3
C
[
r
j
r1 = ( x
Tips to Speed up Notetaking
Here are some rules about abbreviations. Use those that fit
your needs and you can remember easily. Introduce only a few
abbreviations or symbols at a time. Use your imagination and
add to the list use what works best for you.
Langara College - Department of Physics
Principle Units Used in Physics
From Wikipedia, the free encyclopedia http:/en.wikipedia.org/wiki/Main_Page
Metre
The metre or meter (symbol: m) is the fundamental unit of length in the International System of Units
System of Measurement
Units
Fundamental quantities
Mass, time, length
SI System
Other Quantities:
time seconds (s)
mass kilograms (kg)
length meters (m)
Energy Joules (J)
Work Joules (J)
Force, Velocity
Torque, etc.
Definition of meters (m)
One meter is t
Phys 1225-1, spring 2017, HW2
Due Friday Jan 19, anytime (before noon Friday.)
Chap 22
20, 22, 68, 70, 72
Solving Problems
1) Read carefully and analyze the problem.
2) If there isnt one provided, it helps to make a sketch of the situation. For most probl