One way to make a uniform electric field is to use what is known as a parallel-plate capacitor. To make one, you take two metal cookie sheets from your kitchen, and place them parallel to one another. Then, you connect the positive terminal of a 9-volt battery to the top cookie sheet, so that it becomes positively charged, and you connect the negative terminal of the same battery to the bottom cookie sheet, so that the bottom cookie sheet becomes negatively charged. In the picture, the top cookie sheet is drawn in red (positive) and the bottom cookie sheet is drawn in blue (negative). Note that the electric field between the cookie sheets points from the positive sheet to the negative sheet, and has a magnitude of the battery voltage (9 V) divided by the distance between the cookie sheets Part (b) The distance between the cookie sheets is 24.0 cm. An electron (in blue) is given an initial velocity horizontally. The initial velocity of the electron is directed along the line parallel to the cookie sheets and halfway between them. After traveling a horizontal distance of d = 16.0 cm, and the appropriate distance vertically, the electron runs into one of the cookie sheets (you should know which one). Hint: this should remind you of projectile motion. Calculate the time it takes for the electron to reach the cookie sheet.
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Electrostatic Potential and Capacitance
An electrostatic force is a force caused by stationary electric charges /fields. The electrostatic force is caused by the transfer of electrons in conducting materials. Coulomb’s law determines the amount of force between two stationary, charged particles. The electric force is the force which acts between two stationary charges. It is also called Coulomb force.
One way to make a uniform electric field is to use what is known as a parallel-plate capacitor. To make one, you take two metal cookie sheets from your kitchen, and place them parallel to one another. Then, you connect the positive terminal of a 9-volt battery to the top cookie sheet, so that it becomes positively charged, and you connect the negative terminal of the same battery to the bottom cookie sheet, so that the bottom cookie sheet becomes negatively charged. In the picture, the top cookie sheet is drawn in red (positive) and the bottom cookie sheet is drawn in blue (negative).
Note that the electric field between the cookie sheets points from the positive sheet to the negative sheet, and has a magnitude of the battery voltage (9 V) divided by the distance between the cookie sheets
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