Recent content by spottedcow913

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    What Is the Total Energy in an Oscillating LC Circuit?

    In an oscillating LC circuit, L=25 mH and C=7.8 x10^-6 F. At time t=0 the current is 9.2 mA, the charge on the capacitor is 3.8 x 10^-6 C, and the capacitor is charging. What is the total energy in the circuit? I know I just need to do Ub+Ue=U, but here is my question. Are L and C constant...
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    Solving equations simultaneously circuits

    I really struggle with these and would just like someones input on how to best solve these, I can never seem to cancel everything out except the variable I am looking for. I have: E-i1-Ri2=0 Ri2-Ri3=0 i1+i2+i3 I am looking to solve for i1 All R's are equal to 0.73 x10^6 ohms so I just...
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    Potential difference between two points homework

    We worked out this problem in class and I'm still confused: A wire of resistance 5 ohms is connected to a battery whose emf is 2.0 V and whose internal resistance is 1 ohm. In 120 seconds, how much energy is (a) transferred from chemical form in the battery, (b) dissipated as thermal energy in...
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    How Do You Calculate the Capacitance of a Coaxial Cable with Polystyrene?

    A coaxial cable used in a transmission line has an inner radius of 0.10 mm and an outer radius of 0.60 mm. Calculate the capacitance per meter for the cable. Assume that the space between the conductors is filled with polystyrene. Kappa for polystyrene is 2.6 I have no clue how to start or...
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    Calculating Charge in a Circuit with Multiple Capacitors

    Homework Statement So this is just a general question. If I have multiple capacitors, how can I determine the number of electrons at a certain point along the circuit. I know q=ne so I just really need q but that's the biggie. I also know q=CV. So to figure out q at any point, what do I...
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    Finding distance of approaching charges

    Two large parallel copper plates are .05 meters apart and have a uniform electric field between them. An electron is released from the negative plate at the same time that a proton is released fro the positive plate. Neglect the force of the particles on each other and find their distance from...
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    How Is the Charge on a Suspended Oil Drop Determined in Millikan's Experiment?

    In Milikan's experiment, an oil drop of radius 1.64x10^-6 m and density of 0.851 g/cm^3 is suspended in a chamber where the downward electric field of 1.92x10^5 N/C is applied. Find the charge on the on drop. I know that F=qE, but the drop is suspended so it can't really a force because it...