Electric and Magnetic Fields.
22 AugStatement  Spec ref  Comments 
explain what is meant by an electric field and recognise and use the expression electric field strength E = F/Q 
83 

draw and interpret diagrams using lines of force to describe radial and uniform electric fields qualitatively 
84 

use the expression F = kQ_{1}Q_{2}/r^{2}, where k = 1/4πε_{0} and derive and use the expression E = kQ/r^{2} for the electric field due to a point charge 
85 

investigate and recall that applying a potential difference to two parallel plates produces a uniform electric field in the central region between them, and recognise and use the expression E = V/d 
86 

investigate and use the expression C = Q/V 
87 

recognise and use the expression W = ½ QV for the energy stored by a capacitor, derive the expression from the area under a graph of potential difference against charge stored, and derive and use related expressions, for example, W = ½ CV^{2} 
88 

investigate and recall that the growth and decay curves for resistor–capacitor circuits are exponential, and know the significance of the time constant RC 
89 

recognise and use the expression Q = Q_{0} e^{−t/RC}and derive and use related expressions, for exponential discharge in RC circuits, for example, I = I_{0}e^{−t/RC} 
90 

explore and use the terms magnetic flux density B, flux Φ and flux linkage NΦ 
91 

investigate, recognise and use the expression F = BIl sin θ and apply Fleming’s left hand rule to currents 
92 

recognise and use the expression F = Bqv sin θ and apply Fleming’s left hand rule to charges 
93 

investigate and explain qualitatively the factors affecting the emf induced in a coil when there is relative motion between the coil and a permanent magnet and when there is a change of current in a primary coil linked with it 
94 

investigate, recognise and use the expression ε = −d(NΦ)/dt and explain how it is a consequence of Faraday’s and Lenz’s laws 
95 
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