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Lecture

# PHYS 1041 Lecture Notes - Electric Field, Elementary Charge, Electric Potential

3 Pages
73 Views
Winter 2014

Department
Physics
Course Code
PHYS 1041
Professor
Dr.David Fleming

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Physics 1041
Notes
March 17th
Electric Charge:
electric charge: property of electrons and protons
positive attracts negative
positive repulses positive
negative repulses negative
S.I. unit for electric charge is a Coulomb, abbreviated C
1 electron charge: -1.60 x 10-19C
1 proton charge: +1.60 x 10-19C
strength of an electrical force affected by the charge and distance from the charge
To consider the force that a charge 1 (q1) exerts on charge 2 (q2) :
^
2
21
12
r
r
qkq
F
=
where k is a constant, equal to 9.0 x 109Nm2/C2
and r is the distance between the charges
and r(hat) indicates the direction only (has no numerical value)
Supposition Principle:
if there are more than one charge exerting a force on another charge, we consider
the net force
example: if there are 3 charges and we want to consider all electric force being
exerted on charge 3, we take the sum of the electric force charge 1 exerts on
charge 3, and the electric force charge 2 exerts on charge 3
2313
FFF
net
+=
March 19th
Electric Field:
electric field: electric force per unit charge
when E= electric field
when F = electric force
when q= unit charge
then
q
F
E
=
for a given charge placed in the electric field
Voltage:
electric potential difference
consider electric energy per unit charge
EqrF
=

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Description
Physics 1041 Notes March 17th Electric Charge: • electric charge: property of electrons and protons • positive attracts negative • positive repulses positive • negative repulses negative • S.I. unit for electric charge is a Coulomb, abbreviated C -19 • 1 electron charge: -1.60 x 10 C • 1 proton charge: +1.60 x 10 C19 • strength of an electrical force affected by the charge and distance from the charge To consider the force that a charge 1 (1 ) exerts on charge 2 2q ) : ^ kq1 2 F 12 2 r r where k is a constant, equal to 9.0 x 10 Nm /C2 and r is the distance between the charges and r(hat) indicates the direction only (has no numerical value) Supposition Principle: • if there are more than one charge exerting a force on another charge, we consider the net force • example: if there are 3 charges and we want to consider all electric force being exerted on charge 3, we take the sum of the electric force charge 1 exerts on charge 3, and the electric force charge 2 exerts on charge 3 F = F + F • net 13 23 March 19th Electric Field: • electric field: electric force per unit charge • when E= electric field • when F = electric force • when q= unit charge F • then E = q for a given charge placed in the electric field Voltage: • electric potential difference • consider electric energy per unit charge • F = Eqr • energy gained: U ABen moving from position A to position B • potential difference: difference in electrical energy between position A and B, per unit charge ΔU AB • = ΔV AB = E × Δr holds true when electric field is constant in a certain q region kq 1 • V AB = rB • electric field is equal to the negative of the rate of change of voltage with respect to distance − Δv • E = Δx March 21st Electrocardiogram (ECG): • skin surface
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