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  1. n.karthick

    Drawing electric charge from the earth

    Why it will draw charge from earth? already the the capacitor and resistor are at zero potential. There is no closed path in the circuit and hence the capacitor cannot get charged. The law of conservation of energy has to be kept in mind. Work has to be done to charge a capacitor. Where does...
  2. n.karthick

    Basic Concepts @ Capacitor

    As you mentioned the current does not flow inside the dielectric of capacitor. Only the charges (of opposite sign) move outwards from capacitor plates to the voltage source which gives the illusion that circuit is completed.
  3. n.karthick

    How is a voltage drop across a resistor caused?

    Actually Voltage across a circuit between points A and B is the work to be done on a unit charge to move it from A to B. voltage (across A and B) = work done on unit charge (to move from A to B) As you can see, this definition has nothing to do with presence of charges at A or B. If such a...
  4. n.karthick

    Capacitor charging

    Sorry, I was wrong :frown: Energy increase=final energy - initial energy = 2C - 0.5C = 1.5 C and not 0.5 C as I mentioned earlier.
  5. n.karthick

    Capacitor charging

    Yes this is wrong. The energy increase in case 2 is 0.5*C*(2-1)^2 and not 0.5*C*(2^2-1). As per your simulation, energy consumption is same.
  6. n.karthick

    AC Electronics

    Are you talking about pure sinusoidal voltage? Then its differential i.e, cosine gives you its change wrt time.
  7. n.karthick

    Resistance of the tongue.

    If your aim is to check the working of your multimeter, why can't you measure a known resistance and cross check the values. Why i am saying this is, one cannot be sure about resistance of tongue or any thing like that.
  8. n.karthick

    Mutual Inductance: Coil 1 Excited, Coil 2 Open Circuited

    In fact when the second coil is open circuited, the first coil behaves as if it is the only inductor present in the core. So even if the second coil is removed, the flux going through the core \phi_{l21} will be the same.
  9. n.karthick

    Mutual Inductance: Coil 1 Excited, Coil 2 Open Circuited

    Here \phi_{l1} is the leakage flux i.e., the flux which is linking only with first winding and not with second winding and is due to imperfect coupling. The flux \phi_{l21} is the one which interlinks with both windings. Since \phi_{l21} has nothing to do with the second coil's open or short...
  10. n.karthick

    Faraday's Left Hand Rule

    Yes there it is. You might have heard of Lorentz force equation. Please check Wikipedia's page on it and refer any standard text book for detailed explanation. http://en.wikipedia.org/wiki/Lorentz_force
  11. n.karthick

    Resistors in front of capacitors

    Ohh I didn't get it. To my small knowledge, once the capacitor charges to v, the current flow stops from the source and hence the power. So law of conservation of energy wont come in to picture here. There is no compulsion for capacitor to radiate energy or the remaining circuit to act as...
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