Some computer keyboards are based on the idea of capacitance. Each key is mounted on one end of a plunger, the other end being attached to a movable metal plate. The movable plate and the fixed plate form a capacitor. When the key is pressed, the capacitance increases. The change in capacitance is detected, thereby recognizing the key which has been pressed. The separation between the plates is 5.00 mm, but is reduced to 0.150 mm when a key is pressed. The plate area is 9.50 x 10 -5 m 2 and the capacitor is filled with a material whose dielectric constant is 3.50. Determine the change in capacitance detected by the computer.
Dielectric Constant Of Water
Water constitutes about 70% of earth. Some important distinguishing properties of water are high molar concentration, small dissociation constant and high dielectric constant.
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.
Some computer keyboards are based on the idea of capacitance. Each
key is mounted on one end of a plunger, the other end being attached to a
movable metal plate. The movable plate and the fixed plate form a
capacitor. When the key is pressed, the capacitance increases. The
change in capacitance is detected, thereby recognizing the key which has
been pressed. The separation between the plates is 5.00 mm, but is
reduced to 0.150 mm when a key is pressed. The plate area is 9.50 x 10 -5
m 2 and the capacitor is filled with a material whose dielectric constant is
3.50. Determine the change in capacitance detected by the computer.
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