1)What is the physical relationship between the electric field and the electric
ID: 1438492 • Letter: 1
Question
1)What is the physical relationship between the electric field and the electric potential?
2)What is the relationship between the electric field vector and an equipotential line?
3)What is charge escalator model for a battery?
4)What is an emf?
5)What is terminal voltage?
6)What is Kirchhoff’s Loop Law?
7)What is the electric field inside a charged conductor under equilibrium conditions?
8)What is known about the electric field at the surface of the conductor under equilibrium conditions?
9)What is the electric potential inside the conductor under equilibrium conditions?
10)What is a capacitor?
11)What is the significance of the capacitance of the capacitor?
12)What factors determine the capacitance?
13)For capacitors in series, what is true about the charge on each capacitor and the charge delivered by the battery?
14)For capacitors in series, what is true about the voltage on the capacitors and the voltage on the battery?
15)For capacitors in series, what is the charge and voltage on the equivalent capacitance?
16)For capacitors in series, how does the equivalent capacitance compare the capacitances of the individual capacitors?
17)For capacitors in parallel, what is true about the charge on each capacitor and the charge delivered by the battery?
18)For capacitors in parallel, what is true about the voltage on the capacitors and the voltage on the battery?
19)For capacitors in parallel, what is the charge and voltage on the equivalent capacitance?
20)For capacitors in parallel, how does the equivalent capacitance compare the capacitances of the individual capacitors?
21)What are some ways to make the capacitance of a capacitor larger?
22)What is a dielectric?
23)Why is a dielectric useful in a capacitor?
24)How does the electric field in a capacitor with a dielectric compare to the electric field in a capacitor if the dielectric is not present?
25)What is the dielectric strength?
26)What happens if the electric field inside a capacitor containing a dielectric gets too large?
Explanation / Answer
Answers:
1) Electric field (E) =Potential difference(V)/Separation (d)
3)When a wire is connected to a battery, there is a sustatin motion of electrons.A current of 1.5A means that the charge of 1.5C flows the crosssection of the wire persecond. Because Q =Ne the number of electrons transported per second is
N =Q/e =1.5C/1.6*10-19C =9.4*1018electrons
4)The electromotive force (EMF) is the maximum potential difference between two electrodes of a galvanic or voltaic cell. This quantity is related to the tendency for an element, a compound or an ion to acquire (i.e. gain) or release (loss) electrons.
5)Terminal voltage is the voltage output of a device is measured across its terminals. Terminal voltage is calculated by V = emf - Ir
6)Kirchhoff's voltage law (KVL)[edit] The sum of all the voltages around the loop is equal to zero. This law is also called Kirchhoff's second law, Kirchhoff's loop (or mesh) rule, and Kirchhoff's second rule.
7) At equilibrium under electrostatic conditions, the electric field is zero at any point within a conducting material.
8)At equilibrium under electrostatic conditions, anyexcess charge resides on the surface of a conductor.
9) For any location within the charged conductor, the potential difference in that same volume needs to be constant and equal to 0.
10) A capacitor is a device used to store an electric charge, consisting of one or more pairs of conductors separated by an insulator.
11)The capacitor's capacitance (C) is a measure of the amount of charge (Q) stored on each plate for a given potential difference or voltage (V) which appears between the plates:
C=Q/V .
12)
The capacitance of a capacitor depends on the area of the plates and separation between the plates and dielectric material introduced between the plates. We know that C =eoA/d or C' =keoA/d
13)For the capactiors in series tha charge remains the same on all the capacitors, but the potenital will be different .We can get the total charge by Q =Ceq*V
14) For the capacitors in series the total voltage is given by V =V1+V2 because the voltage will be different on each plates in series.
15)Ceq =Q/V and V =V1+V2
16)Ceq =(C1)(C2)/(C1+C2) and 1/Ceq =1/C1+1/C2
17)For the capacitors in parallel where Q =Q1+Q2 is the total stored charge, because the charge will be different on different plates but the potenital difference remains the same.
18)For the capacitors in parallel the votlage remains the same across the all the paltes and the same votlage will be there at the battery.
19) For the capacitors in parallel the charge will be different and votlage remains the same
20) For the equivalent capacitance Ceq =C1+C2
Q =Ceq*V and potential difference V =Q/Ceq
21)
A capacitor can be made variable rather than fixed in value by varying any of the physical factors determining capacitance. One relatively easy factor to vary in capacitor construction is that of plate area, or more properly, the amount of plate overlap.As the shaft is rotated, the degree to which the sets of plates overlap each other will vary, changing the effective area of the plates between which a concentrated electric field can be established. This particular capacitor has a capacitance in the picofarad range, and finds use in radio circuitry.
22)A dielectric is the electrically insulating material between the metallic plates of a capacitor.
23) The term insulator is generally used to indicate electrical obstruction while the term dielectric is used to indicate the energy storing capacity of the material (by means of polarization)
24)
25) Dielectric Strength is a measure of the electrical strength of a material as an insulator. Dielectric strength is defined as the maximum voltage required to produce a dielectric breakdown through the material and is expressed as Volts per unit thickness.
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