PARALLEL PLATES. From previous work, the electric field strength can be found from the electric force on a test charge.

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Presentation transcript:

PARALLEL PLATES

From previous work, the electric field strength can be found from the electric force on a test charge

In a parallel plate apparatus, a charge is forced from one side to the other with the electric field The work done in moving q is

The change in electric potential energy Where is the electric field strength of the plates (in N/C) V is the electric potential applied to the plates (in V) d is the separation distance of the plates (in m)

Note: the electric field strength is independent of the charge and position of the test charge. Ex. The electric field intensity in the region between 2 parallel plates is 300 N/C. If the plates are connected to a battery with a potential of 75 V, what is the separation of the plates?