Electric and Magnetic Fields

Electric FieldsSign up

understand that an electric field (force field) is defined as a region where a charged particle experiences a force · understand that electric field strength is defined as E = F/Q and be able to use this equation · be able to use the equation F = Q1 Q2 / (4 pi epsilon0 r^2) for the force between two charges · be able to use the equation E = Q / (4 pi epsilon0 r^2) for the electric field due to a point charge · know and understand the relation between electric field and electric potential · be able to use the equation E = V/d for an electric field between parallel plates · be able to use V = Q / (4 pi epsilon0 r) for a radial field · be able to draw and interpret diagrams using field lines and equipotentials to describe radial and uniform electric fields

CapacitorsSign up

understand that capacitance is defined as C = Q/V and be able to use this equation · be able to use the equation W = 1/2 QV for the energy stored by a capacitor, be able to derive the equation from the area under a graph of potential difference against charge stored and be able to derive and use the equations W = 1/2 C V^2 and W = 1/2 Q^2 / C · be able to draw and interpret charge and discharge curves for resistor capacitor circuits and understand the significance of the time constant RC · CORE PRACTICAL 11: Use an oscilloscope or data logger to display and analyse the potential difference (p.d.) across a capacitor as it charges and discharges through a resistor · be able to use the equation Q = Q0 e^(-t/RC) and derive and use related equations for exponential discharge in a resistor-capacitor circuit, I = I0 e^(-t/RC), and V = V0 e^(-t/RC) and the corresponding log equations ln Q = ln Q0 - t/RC, ln I = ln I0 - t/RC and ln V = ln V0 - t/RC

Magnetic Fields and Electromagnetic InductionSign up

understand and use the terms magnetic flux density B, flux phi and flux linkage N phi · be able to use the equation F = Bqv sin theta and apply Fleming's left-hand rule to charged particles moving in a magnetic field · be able to use the equation F = BIl sin theta and apply Fleming's left-hand rule to current carrying conductors in a magnetic field · understand the factors affecting the e.m.f. induced in a coil when there is relative motion between the coil and a permanent magnet · understand the factors affecting the e.m.f. induced in a coil when there is a change of current in another coil linked with this coil · understand how to use Faraday's law to determine the magnitude of an induced e.m.f. and be able to use the equation that combines Faraday's and Lenz's laws E = - d(N phi)/dt.