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12 February, 16:49

A parallel-plate capacitor is made of two conducting plates of area A separated by a distance d. The capacitor carries a charge Q and is initially connected to a battery that maintains a constant potential difference between the plates. The battery is then disconnected from the plates and the separation between the plates is doubled. 1) Which of the following remains constant? Oa. Voltage across the capacitor b. Capacitance of the capacitor c. Charge on the capacitor

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  1. 12 February, 19:30
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    C. Charge on the capacitor

    Explanation:

    Read further: Capacitors consist of two parallel conductive

    plates (usually a metal) which are prevented

    from touching each other (separated) by an

    insulating material called the "dielectric". When

    a voltage is applied to these plates an

    electrical current flows charging up one plate

    with a positive charge with respect to the

    supply voltage and the other plate with an

    equal and opposite negative charge.

    Then, a capacitor has the ability of being able

    to store an electrical charge Q (units in

    Coulombs) of electrons. When a capacitor is

    fully charged there is a potential difference,

    p. d. between its plates, and the larger the area

    of the plates and/or the smaller the distance

    between them (known as separation) the

    greater will be the charge that the capacitor

    can hold and the greater will be its

    Capacitance.

    The capacitors ability to store this electrical

    charge (Q) between its plates is proportional

    to the applied voltage, V for a capacitor of

    known capacitance in Farads.
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