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mark asked in Science & MathematicsPhysics · 4 years ago

Capacitor question?

when one of the capacitor plates is already given a charge and the second place is brought near and both are connected to an emf source then will the charge on both plates be equal.

2 Answers

  • Vaman
    Lv 7
    4 years ago

    If both plates are good conductors, then charges will be shared. Otherwise, you may get sparks. Charges will be shared proportional to the area.

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  • 4 years ago

    Your question: "Capacitor question? when one of the capacitor plates is already given a charge and the second place is brought near and both are connected to an emf source then will the charge on both plates be equal."

    Your concept of a capacitor in a circuit is not accurate.

    I do not care to speculate about how one might equate capacitance to static charges. That is not generally how capacitors are used and is strictly theoretical in most cases. But for real-world capacitors, it is as follows:

    The charge is created by a potential difference between one plate and the other. That follows from the polarity of current used to charge the capacitor, i.e., one side is more positive than the other, or more negative, depending on how you want to think of it. A capacitor stores charge until one of two things occurs:

    (1) The dielectric breakdown voltage is reached causing current through the capacitor in the direction it was charging.

    (2) The polarity of charging current reverse causing current in the opposite direction as charging current.

    The latter is what is used to smooth out voltage levels in a power supply.

    An interesting thing about (1) above is how myelinated nerves transmit signals much more quickly than non-myelinated nerves. The electromagnetic component of a nerve impulse travels the speed that charge carriers can traverse the myelinated fiber from node to node rather than the speed at which ion gates can pump sodium and potassium ions (typically, but not necessarily at all neural junctions) to create and maintain a signal.

    This has very real implications in pathology, particularly in demyelinating disorders of the nervous system.

    It also is of practical interest to artificial transmission of electromagnetic signals to the nervous system, either by implants, surface induction transmitters, or remotely directed signals of a more sophisticated nature.

    As far as I know, most published work available to the public one way or another comes from medical-related or prosthetics industry research. But as you might imagine, much more sophisticated research has been conducted and implemented during times and in places where there were plenty of research subjects available at low cost:

    “The largest famine in human history took place in China during 1959-61 … Although drought was a contributory factor, this was largely a manmade catastrophe for which Mao Zedong bears the greatest responsibility … We will never know the precise number of casualties, but the best demographic reconstructions indicate about 30 million dead ", British Medical Journal, December 18, 1999

    "Involuntary organ harvesting is illegal under Chinese law; though, under a 1984 regulation, it became legal to remove organs from executed criminals with the prior consent of the criminal or permission of relatives. Growing concerns about possible ethical abuses arising from coerced consent and corruption led medical groups and human rights organizations, by the 1990s, to start condemning the practice... China Daily reported in August 2009 that approximately 65% of transplanted organs still came from death row prisoners. The condemned prisoners have been described as "not a proper source for organ transplants" by Vice-Health Minister Huang Jiefu..."

    "Soviet weekly newspaper today published the most detailed accounting of Stalin’s victims yet presented to a mass audience here, indicating that about 20 million died in labor camps, forced collectivization, famine and executions... The estimates, by the historian Roy Medvedev, were printed in the weekly tabloid Argumenti i Fakti, which has a circulation of more than 20 million... The estimated number of deaths is about equal to the number of Soviet soldiers and civilians believed killed in World War II...”

    by BILL KELLER, Special to the New York Times, Published: February 4, 1989.

    Accessed 14 January 2015:

    "In June 2007, Russian President Vladimir Putin organized a conference for history teachers to promote a high-school teachers manual called 'A Modern History of Russia: 1945-2006: A Manual for History Teachers', which according to Irina Flige... portrays Stalin as a cruel but successful leader who 'acted rationally', no matter that he executed millions of Soviet citizens... Putin said at the conference that the new manual will 'help instill young people with a sense of pride in Russia', and he argued that Stalin’s purges pale in comparison to the United States’ atomic bombings of Hiroshima and Nagasaki."

    The low life hackers interfering with my editing here are no better.

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