PCS 211 Study Guide - Final Guide: Qv.1, Capacitor, Voltage

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14 May 2017

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Capacitor: two conductors having equal and opposite charge and a potential difference between them. Use: commonly used in electronic circuits (tune frequency circuits, Step 1: a charge of magnitude of q is assumed. Area =a (1) assume the charge is q and -q. Q d (1) assume one plate has a charge q, and other q. (2) e between the sphere (gauss"s law): Vb (cid:2) va = (cid:2) er (cid:1) dr = (cid:2)keq (2) the electric field between two plates: To increase capacitance: increase a or decrease d. 2r (b > r > a) dr b (cid:1) r2a ab (cid:1) ab. In case of an isolated conducting sphere, assume b (cid:1) Potential difference in a parallel circuit is the same. Ceq = qtotal/v = (q1 + q2)/v = q1 /v + q2 /v. Generally, ceq = c1 + c2 + c3 + . Example: if c1 = 2(cid:2)f, c2 = 4 (cid:2)f then ceq = 6 (cid:2)f.

Related Questions

A parallel-plate air-filled capacitor having area 38 cm2 and platespacing 5.0 mm is charged to a potential difference of 300 V. Findthe following values.

(a) the capacitance

(b) the magnitude of the charge on each plate

(c) the stored energy

(d) the electric field between the plates

(e) the energy density between the plates

1.A capacitor stores charge Q at a potential difference ÎV. Whathappens to capacitance and charge if the voltage applied to thecapacitor by a battery is doubled to 2ÎV?

Is ÎV = Voltage across a capacitor??

2.If I double the space between the plates of a parallel platecapacitor, what happens to the capacitance?

3.If I double the area of the plates of a parallel plate capacitor,what happens to the capacitance of the capacitor?

4. If the voltage across a capacitor is doubled, what happens tothe charge on the capacitor? What happens to the energy stored inthe capacitor?

Is this just the same as #1?

I only grouped these 4 since they are very similar, and #1 and 4may even be identical. I lost my notes and have no clue what todo...

A parallel-plate capacitor is connected to a battery of electric potential difference V. If the plate separation is decreased, do the following quantities increase, decrease, or remain the same:

(a) the capacitor’s capacitance,

(b) the potential difference across the capacitor,

(d) the energy stored by the capacitor,

(e) the magnitude of the electric field between the plates,

(f ) the energy density of that electric field?

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PCS 211 Study Guide - Final Guide: Qv.1, Capacitor, Voltage

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Physics: Principles with Applications

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