Potential difference Definition and 688 Threads

Homework Statement An isolated large-plate capacitor (not connected to anything) originally has a potential difference of 1030 volts with an air gap of 2 mm. Then a plastic slab 1 mm thick, with dielectric constant 5.1, is inserted into the middle of the air gap as shown in Figure 16.70. As...

Homework Statement The potential difference between the accelerating plates of a TV set is about 20 kV. If the distance between the plates is 1.0 cm, find the magnitude of the uniform electric field in the region between the plates. Homework Equations V=ED so E=V/D where E is the...

Homework Statement Through what potential difference would an electron need to be accelerated for it to achieve a speed of 5.8% of the speed of light (2.99792x10^8 m/s), starting from rest? Homework Equations E=Vq E=.5mv^2 The Attempt at a Solution Vq=.5mv^2 V=(.5mv^2)/q...

Homework Statement a certain parrallel plate capacitator has a plate separation d and a potential difference between the plates of V. If the electric field between the plates is uniform a) What is the strength of the electric field F Homework Equations Coloumbs Law F=k(q1q2/d^2)...

Homework Statement The 5.00-V battery in the figure ( http://session.masteringphysics.com/problemAsset/1009413/11/yf_Figure_26_42.jpg ) is removed from the circuit and replaced by a 20.00-V battery, with its negative terminal next to point b. The rest of the circuit is as shown in the figure...

Homework Statement The problems tells me to determine the potential difference between between two points. I alrady know that the potential of one point is zero. The problem I am having is that the cirucit has two batteries. I do not have a question so i will describe it, it hsould be easy...

What is the potential difference between two equal charge/line charge/ring charge? Is it zero everywhere, or only in middle of the two?

Homework Statement During a particular thunderstorm, the electric potential difference between a cloud and the ground is Vcloud-Vground = 1.3 X 10^8 V, with the cloud being at the higher potential. What is the change in an electron's electric potential energy when the electron moves from the...

I'm back again this week with a problem: A particle has a charge of +1.5 Micro Coulombs and moves from point A to point B, a distance of .20 m. The particle experiences a constant electric force, and its motion is along the line of action of the force. The difference between the particle's...

Homework Statement The work function of caesium is 1.35eV. A photoelectric cell has a caesium surface and is illuminated with monochromatic light of wavelength 400nm. What reverse potential difference must be applied to the tube to just stop a current passing through it? Homework Equations...

Homework Statement he electronic flash attachment for a camera contains a capacitor for storing the energy used to produce the flash. In one such unit, the potential difference between the plates of a 705 µF capacitor is 320 V. (a) Determine the energy that is used to produce the flash in...

Homework Statement A particle with a charge of -1.5 µC and a mass of 3.0 x 10-6 kg is released from rest at point A and accelerates toward point B, arriving there with a speed of 50 m/s. (a) What is the potential difference VB - VA between A and B? Homework Equations v=(square...

Just wondering how do you calculate the potential difference between Pt A and B in the picture. http://img370.imageshack.us/img370/5554/16004537xc8.th.jpg Value of E: 95 N/C AB=0.33 m the angle is 42 I researched and found an equation V= Ercostheta but I've never seen or used this...

Using your actual knowledge of the actual charge of an electron and the mass of an electron, determine he velocity of an electron that has been accelerated across a potential difference of 100000 volts. Please show me how to do this question. Thanks

Homework Statement A proton, initially at rest, is accelerated through an electric potential difference of 500V. What is the speed of the proton? Homework Equations V=k(q/r) Solving for r: r=k(q/v) v=d/t known charge of a proton: 1.6E-19C known value of k: 9E9Nm^2/C2 The...

1. A positive charged rod is held near, but does not touch a neutral electroscope. The charge on the knob becomes 1) positive and the leaves become positive 2) positive and the leaves become negative. 3) - and the leaves become + 4) - and the leaves become -. I chose 1), but it's wrong. I...

Homework Statement I am given a circuit wherein there is a capacitor C1 followed by a battery of PD E1 followed by a capacitor C2 followed by a battery of PD E2 connected back to C1. Find PD across C1 (v1) and C2 (v2) | _ E2_| C1 = = C2 |_E1_| Homework Equations...

Homework Statement There is no problem but I am trying to understand the definition of 'electrical potential.' What is it. What is electrical potential difference. It is the amount of work needed to move a charge from point A to point B divided by the magnitude of the charge. What is...

Homework Statement How would we find the potential difference given the frequency of the incident light and the kenetic energy of an the emitted electrons? Homework Equations E= hf-W V= w/q e= 1.602*10^-19 The Attempt at a Solution Given: f= 7.4*10^15 Hz KE= 1.9eV...

Homework Statement A small sphere with mass 1.50g hangs by a thread between two parallel vertical plates 5cm apart. THe plates are insulating ahnd have uniform surface charge densities + and - \sigma. The charge on the shpere is q = 8.90 x 10^-6 C. What potential difference between the...

Homework Statement Question: an electron with a velocity of 5.0x10^{}6 m/s is injected into a parallel plate apparatus through a hole in the positive plate. it moves across the vacuum between the plates. what would the potential difference have to be in order to stop the electron 25% of the...

[FONT="Georgia"][SIZE="3"]Homework Statement http://img152.imageshack.us/img152/696/1005200802ps4.png The wire XY in the circuit is made of a material of high resistivity and uniform area of cross-section. What is the potential difference between X and 65cm mark in the circuit? Homework...

[FONT="Georgia"][SIZE="3"]Homework Statement http://img241.imageshack.us/img241/1087/09052008hf9.png What is the potential difference across (i) AB (ii) BC. Homework Equations ?? The Attempt at a Solution (i) \frac{200}{400} \times 6 = 3V Is this right? :confused:

Homework Statement A force of .053 N is required to move a charge of 37 microCoulombs a distance of .25m in an electric field. What is the size of the electric potential difference between the two points? Homework Equations ? The Attempt at a Solution I'm really stuck...

[SOLVED] Average Potential Difference Homework Statement The voltage across the terminals of an ac power supply varies with time according to V=V_0\cos(\omega t). The voltage amplitude is V_0 = 46.0 V From the prior question, I already figured out that the root-mean-square potential...

1. Through what potential difference (\DeltaV) would you need to accelerate an alpha particle, starting from rest, so that it will just reach the surface of a 15 x 10^(-15) m ^{238}U nucleus? 2. KE = q\DeltaV E = \gamma_{p}mc² r = \frac{mv}{qB} 3. Ok, I feel like I am close to what I really need...

Using a Van De Graaff (VDG) machine, we can easily generate million-volt high voltage. The high potential difference can be generated effectively with minimum energy supplied to the machine. The larger the volume of the machine would be, the higher the voltage could get. However, stability...

Homework Statement Find the potential difference of point b relative to point a. Homework Equations The Attempt at a Solution I found out that E1 = 18V and E2 = 7V but I don't know where to go from there.

1) You have a potential difference of 6 volts. How much work is done to transfer .19 coulombs of charge through it? Answer in units of Jules. 2) Through what potential difference would an electron need to be accelerated for it to achieve a speed of 6% of the speed of light(2.99792e8)...

1) You have a potential difference of 6 volts. How much work is done to transfer .19 coulombs of charge through it? Answer in units of Jules. 2) Through what potential difference would an electron need to be accelerated for it to achieve a speed of 6% of the speed of light(2.99792e8)...

Hi anyone can solve this problem? A volume charge density of pv= 1/r^2 uC/m^3 exists in the region bounded by 1.0m < r < 1.5m. Find the potential difference between the point A(3.0, 4.0, 12.0) and the point B (2.0, 2.0, 2.0). Anyone can show me the solution for this problem?

Homework Statement I really need help with this problem. The question is: Each side of an equilateral triangle measures 3.61cm. A charge of -0.34mC is placed at each vertex. what is the potential difference at the midpoint of the base of the triangle? Homework Equations V=kq/r [b]3...

I am stuck on this question about potential difference, the question is: each side of an equilateral triangle measures 3.61cm. A charge of -0.34mC is placed at each vertex. what is the potential difference at the midpoint of the base of the triangle, i need quick help. Thank you.

Homework Statement (a) Determine the capacitance of a Teflon-filled parallel-plate capacitor having a plate area of 1.90 cm2 and insulation thickness of 0.0600 mm. (b) Determine the maximum potential difference that can be applied to the capacitor. kV Homework Equations I THOUGHT C =...

The question is to calculate the speed of a proton that is accelerated from rest through a potential difference of 120V. Qp(charge of proton) ~ 1.60E-19C...with this, DeltaU = Qp*DeltaV...in which DeltaU is positive. It makes sense since the proton is heading towards a higher electric...

Homework Statement Six identical capacitors with capacitance C are connected as shown in figure 30.68 (attachment). What is the potential difference between points a and b? Homework Equations C=Q/V The Attempt at a Solution The Cequivalent = 3/2 C Therefore, Q = CV...

Homework Statement On attachment. Part B only. I got C. Homework Equations mass of proton is 1.673*10^-27 q0 = 1.60*10^-19 The Attempt at a Solution For part B I thought I could divide the intial speed by 2 and plug it back into the energy conservation equation: .5mv^2 + q0V1...

Homework Statement Figure 16.69 A thin spherical shell made of plastic carries a uniformly distributed negative charge -7e-10 coulombs (indicated as -Q1 in the diagram). Two large thin disks made of glass carry uniformly distributed positive and negative charges 1.7e-05 coulombs and...

Homework Statement Through what potential difference would an electron need to be accelerated for it to achieve a speed of 46.0% of the speed of light, starting from rest? The speed of light is c= 3.00 x 10^8 m/s m_e = 9.11 x 10^-31 kg |e| = 1.60 x 10^-19 C Round your answer to three...

A pair of parallel plates is charged by a 12-V battery. How much work is required to move a particle with a charge of --4.0 microcoulombs (MC) from the positive to the negative plate? Given that, Emf = 12 V q = -4 x 10 -6 C I have, Work done (w) = q x V = -4 x 10 -6 x 12...

Hi, I have just started studying EM induction and I got stuck with the derivation of potential difference across a solenoid when the current in it is changing. My textbook (Physics for Scientists and Engineers by Tipler) derives it in very mathematical way just by saying that because the...

[b]1. Consider point a which is 70 cm north of a -4.2 µC point charge, and point b which is 74 cm west of the charge (Fig. 17-23). (a) Determine Vba = Vb - Va. (b) Determine Eb - Ea. Magnitude Direction (counterclockwise from east is positive) [b]2. Vb-Va=(EPEb/q)-(EPEa/q) [b]3...

A lightning flash transfers 4.2 C of charge and 4.5 MJ of energy to the Earth. (a) Across what potential difference did it travel? (b) How much water could this boil and vaporize, starting from room temperature?

[SOLVED] potential difference Consider point a which is 70 cm north of a -4.2 µC point charge, and point b which is 74 cm west of the charge (Fig. 17-23). Figure 17-23. (a) Determine Vba = Vb - Va. V (b) Determine Eb - Ea. Magnitude N/C Direction °...

By convention, potential difference is defined as the \frac{W}{q_0}, where q_0 > 0 correct? When computing potential differences in my textbook, states in the derivation of the relationship that V_f - V_i = \[ \int_i^f E\dot ds\] by assuming a positive charge. From the relationships of...

Homework Statement An electron acquires 3.01e-16 J of kinetic energy when it is accelerated by an electric field from plate A to plate B. What is the potential difference between the plates? _____V Homework Equations - (Wba / q ) = V The Attempt at a Solution - (3.01e-16 /...

Electric Potential Difference...Please HELP! Homework Statement What potential difference is needed to accelerate a He+ ion (charge +e, mass 4u) from rest to a speed of 2690000 m/s? Homework Equations The Attempt at a Solution Change in V = Change in K Change in V = 1/2 mv^2...

Potential difference please help! Homework Statement It takes 3.3 μJ of work to move a 34.26 nC charge from point A to B. It takes -3.3 μJ of work to move the charge from C to B. What is the potential difference VC-VA? Homework Equations Uel = qV The Attempt at a Solution Don't...

[SOLVED] Potential Difference argh ... Homework Statement What is the minimum potential difference that must be applied across an X-ray tube to observe a line of frequency 1.61x10^16Hz Homework Equations OK well we can define potential difference as the amount of energy required to emit...

Homework Statement 12. A strip of copper {150{\textcolor[rgb]{1.00,1.00,1.00}{.}}{\mu}m} thick and {4.5{\textcolor[rgb]{1.00,1.00,1.00}{.}}mm} wide is placed in a uniform magnetic field {\vec{B}} of magnitude {0.65{\textcolor[rgb]{1.00,1.00,1.00}{.}}T}, with {\vec{B}} perpendicular to the...