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electrostatic mill - unit 6phy edexcel
question 1e iii from edexcel june 05 synoptic
any1 know the graph??
thanks
any1 know the graph??
thanks
Maybe if you uploaded the question you would get an answer..
Electrostatic phenomena occur naturally, for example, lightning flashes and
the static electricity produced by friction. Early experimenters, such as
Benjamin Franklin, showed that there is an electric field around the Earth.
This electric field is present because the atmosphere of the Earth acts
as a giant capacitor, positive charge collecting in the ionosphere, which
lies tens of kilometres above the Earth’s surface, and negative charge
collecting on the Earth’s surface. Two A-level students made a device that
used the Earth’s electric field to produce a current. This current was
directly proportional to the Earth’s electric field strength E, so by measuring
the current, the students were able to measure E.
The device, called an electrostatic mill, consists of two horizontal plates.
One is a fixed aluminium plate with two circular holes cut in it, called the
earthed plate. Below and close to this is a circular aluminium disc called
the vane plate with two identical holes cut in it. The vane plate is rotated
at a constant speed by a motor, and the holes are cut in such a way that the
overlap between the two sets of holes varies from zero to a maximum.
As the vane plate rotates, the Earth’s electric field produces an induced charge
on the vane plate and, by suitable connections to the plates, a small varying current can be detected. The peak value of this current can be found by passing the current through a resistor and measuring the resulting peak potential difference across the resistor.
At any place where the Earth’s electric field strength is E, the charge induced on the vane plate is given by q = ε0EA. In this equation A is the area of the vane plate that the Earth’s field reaches through the holes in the earthed plate and ε0 is a constant equal to 9.0 x 10 –12 Fm–1. This induced charge varies as the vane plate rotates below the earthed plate. When the overlap is a maximum, i.e. when the holes are aligned, A is zero, and the induced charge is then effectively zero.
In terms of applications, an electrostatic mill could be used to detect the build-up of charge in the atmosphere, such as would occur before a lightning strike, or to check the electric field strength under power lines.
(iii) Sketch a curve showing how the current in an electrostatic mill varies with time when the frequency of rotation of the vane plate is 50 Hz. Give values on the time axis.
the static electricity produced by friction. Early experimenters, such as
Benjamin Franklin, showed that there is an electric field around the Earth.
This electric field is present because the atmosphere of the Earth acts
as a giant capacitor, positive charge collecting in the ionosphere, which
lies tens of kilometres above the Earth’s surface, and negative charge
collecting on the Earth’s surface. Two A-level students made a device that
used the Earth’s electric field to produce a current. This current was
directly proportional to the Earth’s electric field strength E, so by measuring
the current, the students were able to measure E.
The device, called an electrostatic mill, consists of two horizontal plates.
One is a fixed aluminium plate with two circular holes cut in it, called the
earthed plate. Below and close to this is a circular aluminium disc called
the vane plate with two identical holes cut in it. The vane plate is rotated
at a constant speed by a motor, and the holes are cut in such a way that the
overlap between the two sets of holes varies from zero to a maximum.
As the vane plate rotates, the Earth’s electric field produces an induced charge
on the vane plate and, by suitable connections to the plates, a small varying current can be detected. The peak value of this current can be found by passing the current through a resistor and measuring the resulting peak potential difference across the resistor.
At any place where the Earth’s electric field strength is E, the charge induced on the vane plate is given by q = ε0EA. In this equation A is the area of the vane plate that the Earth’s field reaches through the holes in the earthed plate and ε0 is a constant equal to 9.0 x 10 –12 Fm–1. This induced charge varies as the vane plate rotates below the earthed plate. When the overlap is a maximum, i.e. when the holes are aligned, A is zero, and the induced charge is then effectively zero.
In terms of applications, an electrostatic mill could be used to detect the build-up of charge in the atmosphere, such as would occur before a lightning strike, or to check the electric field strength under power lines.
(iii) Sketch a curve showing how the current in an electrostatic mill varies with time when the frequency of rotation of the vane plate is 50 Hz. Give values on the time axis.
Max to zero, sinusoidally with min at 0 and max at the peak. Think about the way the holes open and close.
Wavelength is 0.01s, it's a sine curve. Sinusoidally doesn't just mean it follows the equation y = sinx.
Wavelength is 0.01s, it's a sine curve. Sinusoidally doesn't just mean it follows the equation y = sinx.
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