13_voltageuniformfield

13_voltageuniformfie - Lesson 13 Voltage in a Uniform Field Most of the time if we are doing experiments with electric fields we use parallel

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Lesson 13: Voltage in a Uniform Field Most of the time if we are doing experiments with electric fields, we use parallel plates to ensure that the field is uniform (the same everywhere). This carries over to our study of voltage. If we use parallel plates, then we also get a uniform change in potential difference. If a charged particle is released between the plates, it will move on its own from an area of high potential, to an area of low potential. If the charge is moved a distance, d, the change in electric potential energy can be found with… W = Fd => which is the same as => ΔE p = Fd Combine that with V = E q to get. .. V = E q = Fd q = F q d ...and we know that E = F e q so. .. V = E d Although you can certainly use the formula this way, we see it on the data sheet as. .. E ∣= V d E = electric field (N/C) ΔV = voltage (V) Δd = distance between locations (m) This formula is typically applied to situations where parallel plates are being used, since this is the easiest way to have a uniform electric field. The direction for the field is still determined by the direction a positive test charge would move. Also, notice that because of this formula, we can show that the electric field can also be measured in V/m, not just N/C. Try to prove that the units for V/m are equivalent to N/C . .. my hint is that you should try to break all the derived units down to base units. Example 1 : We have two parallel plates that are 16.0mm apart. a) If we want a uniform field of 800 N/C between these plates, determine the voltage we must apply to the plates. E ∣= V d V =∣ E ∣ d V = 800 0.0160 V = 12.8 V 10/12/2011 © studyphysics.ca Page 1 of 5 / Section 11.2 & 11.3

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b) Determine how much work is done if an alpha particle ( info on your data sheet ) moves from the positive plate to the negative plate. V
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This note was uploaded on 12/02/2011 for the course PHYSICS 235 taught by Professor Staff during the Fall '08 term at Rutgers.

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13_voltageuniformfie - Lesson 13 Voltage in a Uniform Field Most of the time if we are doing experiments with electric fields we use parallel

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