Recent content by Gordianus

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    What did you do with your old college textbooks?

    I keep almost all of them. I had to work many hours to buy those books and I'm attached to them. Math and Physics books don't get outdated.
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    Flux through a ring due to two charges

    We're dealing with an open surface and we should choose the normal vector (I know I'm a bit pedantic).
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    Voltmeter readings for this circuit with switches

    I have another concern- The current sources can't perform whenever any of the switches is open. The circuit makes no sense.
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    Voltmeter readings for this circuit with switches

    Could you draw the voltmeters?
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    Capacitor charge time, two conflicting answers

    Charging a capacitor with constant current has been used many times in timing circuits.
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    Reconcile poundforce w/slug and lbmass

    If the spring scale was calibrated with the factor 32.2 in mind, it would read less than 1 pound of force
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    Not a typical RL circuit...

    What formula did you use for I(t)?
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    How to Measure Current in a Hall Bar Device Using SR830 Lock-in Amplifier?

    I'm sorry but I don't understand what you want to do. Could you post a diagram?
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    How to Measure Current in a Hall Bar Device Using SR830 Lock-in Amplifier?

    The SR 830 has a current measurement mode shown in the user manual. However, most Hall devices provide an output voltage. Do you want to measure a DC or AC magnetic field?
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    A question about a wheel rolling without slipping while tied to a cube

    This YouTube video may help:
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    Faraday's Law and magnetic flux

    Can you make a nice drawing that shows how you came to the conclusion?
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    Calculating flux through a plane cutting two concentric cylinders

    I remember Gauss' Law refers to a closed surface. I think the plane isn't a closed one.
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    Calculation of charge flowing through a loop

    Let me plot with with Geogebra (can I do this?) the cosine part of the magnetic flux: The sign of the first derivative doesn't change in the range from zero to 120 degrees. Thus, if we assume the loop's resistance is high enough to neglect inductance effects, the induced flows in the same...
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    Calculation of charge flowing through a loop

    Keep in mind that flux carries a dot product and sign matters.
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    Calculation of charge flowing through a loop

    Why did you change from cos(beta) to |cos(beta)| ?