School responsibilities for energy electric fields in Education

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School responsibilities for energy electric fields in Education & Career Forum; Hey! I have a problem with my homework! low blood sugar symptoms We have now again the topic of electrical energy and have tasks ...
Hey! I have a problem with my homework! We have now again the topic of electrical energy and got tasks to do so. I myself was now the last hours of sick and bruchte some help with the Anstzen. I hope someone here can help me and you have the task not count, only just a little help in the approach. low blood sugar symptoms 1) In the air above a field strength of triit 2.5x10 ^ 6 V / m Funkenberschlag. a) What are the energy density is in the air even possible? b) How many times is so large, the usable coal energy density (Verbrennungswrme: 3x10 ^ 7 J / kg; density: 1.2 g / cm)? 2) Two kreisfrmige plates of 24cm diameter have the distance 4.0mm. a) Calculate the energy content and energy density U = 3,0kV or U = 6.0 kV. b) What is the force to pull the plates? c) How large the voltage when the voltage level indicating the attractive force of 1.0N? 3) A Kondesator of 10F is charged to 200V and 100V in parallel on the same charged capacity without load is lost. What voltage accept the capacitors? How much electrical energy is lost? 4) Determine the total energy of a ball field (spherical radius R, charge Q) at a distance r bigger than / equal to R from the center.
Hello, low blood sugar symptoms first for understanding the equations: ----- Task 2 energy of the field: W = 1/2 * Q * U with Q = C * U receives one W = 1/2 * C * U Continuing with U = Ed and C = E0 * he * A / d [E0 = electrical. Field constant) into W = 1/2 * C * U leads to: W = 1/2 * E0 * he * A / d * e * d = 1/2 * E0 * he * E * A * d and as V = A * d: W = 1/2 * E0 * he Here E and V are * E * V variable, low blood sugar symptoms thus the energy field. Energy density: The energy density is demenstrechend Roh = W / V = 1/2 * E0 * he * E (energy / volume) field strength: When pulling the plates, the volume changed: DELTA_V = A * delta_d low blood sugar symptoms ... and, consequently, the energy of the field: DELTA_W = 1/2 * E0 * he * E * DELTA_V to pulling force F = DELTA_W / delta_d is bentigt. (Because W = F * d) => substituted into the equation for the energy field You can retrieve for the force F: F = 1/2 * E0 * he * E * A / * delta_d delta_d F = 1/2 * E0 * he * E * A using ----- Well .. this equation you should definitely can solve Aufg.2. ----- Task 4: Only the AnAnsatz because I have to go now ... SIGMA = Q / A = E0 * E <=> E = Q / (A * E0) Finishing A a ball: A = 4Pi * r => E = Q / (A * E0) = E = Q / (4Pi * r * E0) ----- The rest (except 1) and can I write you later I would have one more time just look. If you have questions, please register Many Gre, cosypanther
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