Chapter 6 - Electrostatic 

Columbs Law

Electric charge is measured in Columbus.

C=6.25x10^16 e

e=1/6.25x10^16 or 1.6x10^-19

F=KQ1Q2/d^2

d=meters

Q=columbs

K=9x10^9 N m ^2 c^-2

Electric Fields

E=F/q

E=KQ/d^2

Electrical potentials and electrical potential energy

it requres work to move together charges od the same polaritt or remove opposite charges.

Electric poptential energy is the capacity of electric charges to do work due to their position in a field

Electrical potential (V) is the potential energy stored at any point

Sum V = SumV/Q = W/Q = qEd/q = Ed = Kq/d

When graphing electrical potential with distance from field the area under the graph reprsents the work done.

Defining Magentic Field Strength

The Magnetic field produced by the conducting wire produces a circula magentic field.

Moving charges produce magentic fields. Place a moving charge in a magnetic field and it will interact with the field. A force on the moving charge is exprencied.

A charged partical can be accelerated by an electric or magnetic field becuase it expreces a force when influinced by either or both field.

Electirc fields can accelrate both moving and stationary charged particales.

Magentic feilds can only influence a moving charge.

The unit of magnetic field strength is Tesla (T)

T=1NC-1m-1s

To determine the strength of the magnetic field at a distance from a current-carrying wire:

B=(u0/2pi)*(I/R)

where I=Current (in A)

r=Distance from the wire (in m)

u0=(the magenetic permeability constant = 4pi*10^-7 TA-1m

F=BILsin(o)

Many coils of wire, as in a solenoid act as a bar magnet. the north pole of the solenoid is given by the right hand rule and thumb points to N.

B=u0nl where n is the amount of coil per meter

1. YES
2. \

a. N <--

b. A up B down

3. 24,000

4. 0.00000023

5. His model failed to explain the stability of atoms. The arrangement of electrons in a circular path was not defined. Any particle that is moving in a circular path would undergo acceleration and radiates energy. Thus, the revolving electron would lose energy and finally fall into the nucleus.

6. \