Field strength Definition and 354 Threads

Limit Problem --- Electric field strength of an infinite line of charge Homework Statement What is the limit of the following equation? Homework Equations \stackrel{lim}{L\rightarrow\infty} \frac{K|Q|}{r\sqrt{r^{2}+(L/2)^{2}}} The Attempt at a Solution The book gives an answer...

1. Homework Statement The electric field strength 7.79 cm from a very long charged wire is 2660 N/C. What is the electric field strength (in N/C) 12.7 cm from the wire? 2. Homework Equations E= (9*10^9) Q/ r^2 3. The Attempt at a Solution i have energy. so is tried to solve...

Homework Statement The electric field strength 8.05 cm from a very long charged wire is 1310 N/C. What is the electric field strength (in N/C) 30.0 cm from the wire? Homework Equations E=F/Q E=KQ/R^2 The Attempt at a Solution First I try to find the charge using E=KQ/R^2...

Homework Statement This is a question on a past paper of a second-year undergraduate physics paper. A parallel plate capacitor is charged and the voltage increases at a rate of dV/dt. The plate radius is R and the distance between the plates is d. (a) What is the electric field...

It is not a homework problem, thought it can kinda be. But when they show you a diagram with object A and B, If the electric field point towards A and away from B. Does that mean that A is + and B is -?

Homework Statement - How much is the electrical voltage U between two evenly electrified parallel flat plates, distanced d = 1 cm, if the strength of electric field between them is E = 1 V / m? - - What is the strength of electric field to the left and to the right of each plate? - What is...

Hey i worked out this answer for the electric field strength at a point due to three point charges. E = -46736i + 46736j -39546k How do i convert this to V/m? eg. 12345 V/m I have checked everywhere Thanks for any help

If the electric field lines are curved as opposed to straight, say from straight parallel lines parabolic curves develop, would there be any change in the field strength? ie would it be stronger when the lines are parallel than when they curve?

Gravitational force is divided by distance squared. What is the equivalent divisor for a fixed bar magnet? Thank you for your kind attention :-) (-_-)

Homework Statement What is the magnetic field strength on Earth's surface at either pole? Earth's magnetic dipole moment is D_0 What is the magnetic field strength on Earth's surface at either pole? B = ____ G Homework Equations _u = NIA ; N is the number of turns I is current, A...

Can gravitational field strength cause time dilation. as G.F.S on Earth is 10 N/kg and on moon it is 1.6 N/kg. so will a clock on the moon surface tick slowly for the observer on Earth or not?

Hi all, I was wondering if anyone knew, or if anyone knows where I can find, the maximum magnetic field that a micro - electromagnet can put off... I am sure this depends on a lot (thermal degredation, materal properties etc) but I just need an estimation as I am running a simulation and need a...

I'm new to the forum, so hello! How can i calculate the magnetic field strength of the pulse of an air core coil, the number of turns is 20 & the height of the coil is 20mm, not single or multi layered just random wound. The pulse is 10V & 1Amp, the Inductance is 200uH. Not sure how to go...

I have a component made of some sort of stamped steel which has a significant magnetic field (upto 2000mGa) which I need to use near a sensitive magnetic sensor. The field is high enough to saturate the sensor so I can't calibrate it out. Does anyone have any idea about degaussing? I tried...

Lets say I have a point charge X placed on a region between a +Q test charge and +2Q point charge where electric field strength is zero. Since E=-dV/dR, does it mean V=0 or constant? Can the point charge move if i place it there? Well let's just ignore gravitational field/force here.

Hi ! I've a question. Where is the connection between the (kinetic) Lagrangian - \dfrac{1}{4} F_{\mu \nu} F^{\mu \nu} and a plane wave of the form \vec{\varepsilon} exp(i \vec{k} \cdot \vec{x}) / \sqrt{V} (the epsilon is a polarization vector) confined in a box with a finite volume V ? I...

what are the components to find the magnitude of the electric field strength when only potential difference and that there are two oppositely charged plates that are separated by a given distance.

Homework Statement A square, with charges at each corner. The upper left (1) has a charge of +q. The upper right (2) has a charge of -2q. The bottom right (3) has a charge of +2q. The bottom left (4) has a charge of -q. The square has side length a. a = 5.20 cm and q = 11.8 nC Find...

Homework Statement if linearly polarized light has an electric field strength E, what is its field strength after it has passed through polarizing material that has a transmission axis oriented at an angle theta relative to the direction of E? Homework Equations none.The Attempt at a Solution...

Homework Statement The gravitational field strength of an unknown planet is 15.5 N/kg on its surface. Calculate the value of “g” if the planets mass and radius were both doubled. Hint: Use variation. Homework Equations g= GM /R2 The Attempt at a Solution Well my teacher gave a...

what the energy spectrum to second order in the field strength for a spherical shell?

Homework Statement 50 pJ of energy is stored in a 2.0 cm*2.0 cm*2.0 cm region of uniform electric field. What is the electric field strength? Homework Equations not sure The Attempt at a Solution not sure how to start this problem

Please help me with the following: What is the field strength needed to achieve a current density of 5 x10^4 [Am^-2] in a conductor of resistivity 5 x 10^-8 [Ω m] The answer I got was 2.5 x 10^-3 N C^-1 using the equation J = σ E But then I was wondering when a situation like this occurs and...

Homework Statement The tallest spot on Earth is Mt. Everest. But another well-known mountain is the Mont Blanc, European Alps, which is 4807 m above sea level. If the radius of the Earth to sea level is 6367 km, how much does the gravitational field strength change between the sea level value...

Homework Statement Consider three charges arranged as shown. What is the magnitude of the electric field strength at a point 2.7 cm to the left of the middle charge? The value of the Coulomb constant is 8.98755 × 109 N · m2/C2 . Answer in units of N/C. Homework Equations I'm truly...

Hello, I read chapter 7.1 of "An Introduction to Quantum Field Theory" by Peskin and Schröder and have two questions. They derive the two point function for the interacting case. On page 213 they manipulate the matrix element, after insertion of the complete set of eigenstates. <\Omega...

Dear All, How do i calculate the Electrical field strength in v/mm for a Kapton Insulated Cable. Conductor AWG 24/19 - 0,6 mm Kapton wall thickness : 1,0 mm Voltage : 15 KV Thanks.

Homework Statement Two 2.0-cm-diameter insulating spheres have a 6.50 cm space between them. One sphere is charged to + 89.0 nC, the other to - 95.0 nC. What is the electric field strength at the midpoint between the two spheres? Homework Equations Esphere = KQ/r^2 k = 8.99 * 10^9...

As a pendulum can be used to calculate the gravitational field strength by using the equation Time period= 2(pi) sqrt (length/g) this equation assumes that the pendulum bob is moving in Simple harmonic motion. However at very small lengths the pendulum bob tends to move in a more...

Homework Statement A space station consists of two living modules attached to a central hub on opposite sides of the hub by long corridors of equal length. Each living module contains N astronauts of equal mass. The mass of the space station is negligible compared to the mass of the astronauts...

Hello, I'm learning EM from Bleaney & Bleaney and got stuck on Ex2.1 (can do Ex2.2-2.7, though...) - If the polarization charge on the surface of a spherical cavity is -s.cos(theta), prove that the field strength at the centre is s/3e0. If I expand V(r) within the cavity as A.r.cos(theta) +...

Homework Statement This is part of a lab I did, I am working on the writeup now. We placed a coil of wire inside of a Helmholtz pair, with 20V of 60Hz AC through the Helmholtz pair. The coil inside was connected to an oscilloscope and the induced voltages were recorded. I now need to...

Homework Statement Suppose the resonant frequency is f = 1.47×1010 s−1; that is, the electron period of revolution is T = 6.80×10-11 s. What is the corresponding strength of the magnetic field? Homework Equations qvb=mv2/r qb=mv/r The Attempt at a Solution 1.6E-19*b=9.1E-31*v/r...

Hello Everyone, I've been trying to get the answer to this problem for ages now and I just can't match my answer with the one in the back of the textbook. I hope you can let me know what I'm doing wrong. Homework Statement What is the gravitational field strength at a place 220 km above...

Homework Statement A solid sphere 25cm in radius carries 14uC, distributed uniformly throughout its volume. Find the electric field strength (a.) 15cm, (b.) 25cm, (c.) 50cm from the sphere's center. R = .25m Q = 14 * 10^-6 C Homework Equations p = q/(volume) E = (kq)/r^2 The...

Homework Statement (a) Find the altitude above the Earth's surface where Earth's gravitational field strength would be two-thirds of its value at the surface. Assume re = 6.371 multiplied by 10^3 km. wrong check mark km (b) Find the altitude above the Earth's surface where Earth's gravitational...

A 124 cm diameter loop is rotated in a uniform electric field until the position of the maximum electric flux is found. The flux in this position is measured to be 6.33 x 105. What is the electric field strength?

Homework Statement Calculate the electric field strength and the direction on the z-axis resultant from 3 line charges of blah blah and blah located at (x,y), (x1,y1), (x2,y2) respectively. Homework Equations I assume I just use E = k.Q/r^2 The Attempt at a Solution So I work out...

Homework Statement Two straight parallel wires are placed vertically on a wall. The distance between the wires is 12 cm and the current through each one is 7.5A. In the left wire the current is directed upwards and in the right one the current points downwards. Determine the magnetic field...

The electric field strength 5 cm from a very long charged wire is 2000N/C . What is the field strength 10 cm from wire. A)1x10^-4 N/C B)1x10^3 N/C C)9.9x10^7 N/C D) None of these I have E=kq/r^2 and infinite line charge E=(2k\lambda)/R 2000 * .05 m^2 /K =q q=5.56 E-8 k5.56E-8/.^21 m =...

Hey guys, I trying to work out this formula for work. We have a magnetic solenoid that is suspended a certain distance from a sensor tool. This sensor has 3 magnetometers that measure the field strength in Bx,By,Bz directions. The magnetic solenoid is run with a constant current of 0.75A. We...

Does Earth's magnetic field strength increase with depth?

A bit of a problem. My book teaches me that E = -(dV/dx), where E is the electric field strength, V is the electric potential, and x represents displacement. But, it also suggests along with the above formula that E = -(V/d) and displays a circuit with a battery of p.d. V and two parallel...

Please check the attachment. The question is: Find the gravitational field strength at the point A in terms of G. So I went about assuming we use g = GM/r^2, for both masses, and then subtract them as we're meant to find the overall using vectorial addition. But, the answer in the back...

Homework Statement Two plates each have an area of 80cm2 and are placed facing one another in a vacuum. If the top plate carries a positive charge of 25nC and the bottom plate carrie, a charge of -25nC. Find the electric field strength between them. Permitivity of free space = 8.9 * 10^-12...

I am trying to recreate the Stern-Gerlach experiment and am having trouble trying to calculate the gradient magnetic field. I am using two magnets with one having a sharp edge and the other flat. I have calculated what the deflection will be of the electron will be in terms of the gradient...

this is just a question i can't seem to find an answer for, but i was wondering how strong a 5 tesla magnetic field is?

The question in question: "If charge was plotted versus electric field strength; what shape of graph would you get? How would you straighten in? What quantity would the slope of the straightened graph represent?" Related equation: |E|= F/q Ignoring the graphing information, the question...

[SOLVED] Distance between two charges where field strength = 0 Homework Statement Two particles having charges q1 = 0.500 nC and q2 = 9.00 nC are separated by a distance of 2.00 m. At what point along the line connecting the two charges is the total electric field due to the two charges...

Another noobish question: Let's say there is an electromagnetic wave of constant wavelength and constant peak amplitude that travels a known distance. Let's say that we also know the total energy of this EM wave. Is there some formula that can tell us what the peak value of the electric field is...