IB PHYSICS (SL) - MS. COOPER
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5.  Electricity and magnetism

5.1 ELECTRIC FIELDS

Understandings:
  • Charge
  • Electric Fields
  • Coulomb's Law
  • Electric Current
  • Direct Current (dc)
  • Potential Difference
Applications and skills:
  • Identifying two forms of charge and the direction of the forces between them
  • Solving problems involving electric fields and Coulomb's law
  • Calculating work done in an electric field in both joules and electronvolts
  • Identifying sign and nature of charge carriers in a metal
  • Solving problems using the drift speed equation
  • Solving problems involving current, potential differences and charge
Guidance:
  • Students will be expected to apply Coulomb's law for a range of permittivity values



Utilization:
  • Transferring energy from one place to another (see Chemistry option C and Physics topic 11)
  • Impact on the environment from electricity generation (see Chemistry sub-topic C2 and Physics topic 8)
  • The comparison between the treatment of electric fields and gravitational fields (see Physics topic 10) ​
Data booklet reference:​
Picture
Practice and review:
Drawing Electric Field Lines (Physics Classroom)
E Field lines
E Field Lines WS & SOLNs
5.1 Problem SET 1
5.1 Problem Set 1 solns

5.2 HEATING EFFECT OF ELECTRIC CURRENTS
Understandings:
  • Circuit diagrams
  • Kirchoff's circuit laws
  • Heating effect of current and its consequences
  • Resistance expressed as R = V/I
  • Ohm's law
  • Resistivity
  • Power dissipation
Applications and skills:
  • Drawing and interpreting circuit diagrams
  • ​Identifying ohmic and non-ohmic conductors through a consideration of the
  • Solving problems involving potential difference, current, charge, Kirchhoff’s circuit laws, power, resistance and resistivity
  • Investigating combinations of resistors in parallel and series circuits
  • Describing ideal and non-ideal ammeters and voltmeters
  • Describing practical uses of potential divider circuits, including the advantages of a potential divider over a series resistor in controlling a simple circuit
  • ​Investigating one or more of the factors that affect resistance experimentally
Guidance:
  • The filament lamp should be described as a non-ohmic device; a metal wire at • a constant temperature is an ohmic device
  • The use of non-ideal voltmeters is confined to voltmeters with a constant but finite resistance 
  • The use of non-ideal ammeters is confined to ammeters with a constant but non-zero resistance
  • Application of Kirchhoff’s circuit laws will be limited to circuits with a maximum number of two source-carrying loop 
Utilization:
  • Although there are nearly limitless ways that we use electrical circuits, heating and lighting are two of the most widespread 
  • Sensitive devices can employ detectors capable of measuring small variations in potential difference and/or current, requiring carefully planned circuits and high precision components 
​​Data booklet reference:​
Picture

5.3 ELECTRIC CELLS

Understandings:
  • Cells
  • Internal resistance
  • Secondary cells
  • Terminal potential difference
  • Emf
Applications and skills:
  • Investigating practical electric cells (both primary and secondary) 
  • Describing the discharge characteristic of a simple cell (variation of terminal potential difference with time) 
  • Identifying the direction of current flow required to recharge a cell 
  • Investigating combinations of resistors in parallel and series circuits
  • Determining internal resistance experimentally 
  • Solving problems involving emf, internal resistance and other electrical quantities ​
Guidance:
  • Students should recognize that the terminal potential difference of a typical practical electric cell loses its initial value quickly, has a stable and constant value for most of its lifetime, followed by a rapid decrease to zero as the cell discharges completely
Utilization:
  • The chemistry of electric cells (see Chemistry sub-topics 9.2 and C.6) ​
Data booklet reference: 
Picture

5.4 MAGNETIC EFFECTS OF ELECTRIC CURRENTS
Understandings:
  • Magnetic fields
  • Magnetic force
Applications and skills:
  • Determining the direction of force on a charge moving in a magnetic field
  • Determining the direction of force on a current-carrying conductor in a magnetic field
  • Sketching and interpreting magnetic field patterns
  • Determining the direction of the magnetic field based on current direction 
  • Solving problems involving magnetic forces, fields, current and charge
​​Guidance:
  • Magnetic field patterns will be restricted to long straight conductors, solenoids, and bar magnets

Data booklet reference:
Picture

Practice and review:
​

5.1 Problem Set 1
Videos:
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  • Home
  • SL 1
  • SL 2
  • RESOURCES
  • IA
  • G4P
  • EE
  • 1. Measurement
  • 2. Mechanics
  • 3. Thermal
  • 4. Waves
  • 5. E & M
  • 6. Gravitation
  • 7. Nuclear
  • 8. Energy
  • Practice Paper 1
  • Practice Paper 2
  • Practice Paper 3
  • SL Investigations
  • SL 1