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Exponential Decay.

When the charge on capacitor C decreases by ΔQ through fixed resistor R in time Δt, I = V/R where V = Q/C. This means that I = Q/RC and ΔQ the change in charge becomes -QΔt/CR.The curves all have the same shape as the current is proportional to the charge and the charge is proportional to the potential difference.

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Specification: OCR Physics A (H556), A-level, 6.1.3 Charging and discharging capacitors. Topic: Capacitors.

Key terms in this lesson

magnetic field
A region of space in which a moving charge, current-carrying conductor or magnetic material experiences a force.
motor effect
The force produced on a current-carrying conductor placed in an external magnetic field.
Lenz's law
The direction of an induced current is always such as to oppose the change that caused it.
magnetic flux
The product of the magnetic flux density and the area through which the field lines pass at right angles.
magnetic flux linkage
The product of the magnetic flux through a coil and the number of turns on the coil.

More in Capacitors

All 12 lessons in Capacitors · All OCR A-level Physics topics