In physics, field strength means the magnitude of a vector-valued field (e.g., in volts per meter, V/m, for an electric field E).
For example, an electromagnetic field results in both electric field strength and magnetic field strength.
As an application, in radio frequency telecommunications, the signal strength excites a receiving antenna and thereby induces a voltage at a specific frequency and polarization in order to provide an input signal to a radio receiver. Field strength meters are used for such applications as cellular, broadcasting, wi-fi and a wide variety of other radio-related applications.
I have to construct an experiment which measures the electric field strength at various distances from a charged Van Der Graaff generator. How would i go about this?
Homework Statement
2 masses, 5k and 10kg are fixed in place at the coordinates 1,0 and 1,1 respectively. what combined gravitational field strength do they produce at the point 0,0?
Homework Equations
g = GM/r^2
The Attempt at a Solution
total g = G(5)/(1)^2 +G(5)/2
not the right answer...
Homework Statement
http://img219.imageshack.us/img219/3310/problemi.png
Homework Equations
F = kq/r^2
The Attempt at a Solution
O ----- x ----O -----------O
Let the electric field of the first O be E1, second be E2, third be E3.
RED - .02m
BLUE - .016m
GREEN - .033m
E1...
1. Estimate the electric field (strength and direction) at the point A.
5cmx5cm gridL
2. E = -dV/ds
3. I had four options, each a combination of 500 or 1000V/m for the E field strength and then left or right for the direction. I knew it must be to the left because the field...
Homework Statement
Estimate the strength of the magnetic field for which Zeeman splitting of the 3p energy
levels in sodium equals the energy due to spin-orbit coupling
Homework Equations
The Attempt at a Solution
I know the equations for spin orbit and the zeeman effect, and I...
please help??
1. Homework Statement
I got 1/2 of this problem right, but I am not sure of the other part. I have attached the picture. The questions are as follows (with the answers that I am sure of) --
What is the magnetic field strength at point 1 in the figure?
What is the magnetic...
Homework Statement
I got 1/2 of this problem right, but I am not sure of the other part. I have attached the picture. The questions are as follows (with the answers that I am sure of) --
What is the magnetic field strength at point 1 in the figure?
What is the magnetic field direction at...
This figure is captured from my physics textbook and it is about the gravity at latitude
http://pix.gogobox.com.tw/out.php?i=567045_.JPG
I want to know the difference between mg0 and mg(theta). Which one is the weight of the object? Thank you!
Homework Statement
You have 10 m of 0.55 mm diameter copper wire and a battery capable of passing 13 A through the wire. What magnetic field strength could you obtain inside a 2.8 cm diameter solenoid wound with the wire as closely spaced as possible?
Homework Equations
Turns of a...
Homework Statement
Magnet A has twice the magnetic field strength of magnet B and at a certain distance pulls on magnet B with a force of 55 N. With how much force, then, does magnet B pull on magnet A?
Homework Equations
unknown
The Attempt at a Solution
unknown
wire 1 has a current of 1A directed into the page, wire 2 is 20 cm to the right of wire 1 with a current of 1A, what direction does this current have to flow in order for the magnetic field strength at the mid point between them to be non zero ?
from the right hand rule the mag field from...
Homework Statement
What is the relationship between electric field strength and the potential gradient?
Homework Equations
The Attempt at a Solution
This is my Calc based Physcis lab question but I am at a total loss. I do not understand what potential gradient is in the...
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
Homework Statement
In such a picture,
http://i1021.photobucket.com/albums/af335/hectoryx/electrostaticequilibrium_1.jpg
Induced charges will emergence on the left and right side of non-perfect conductor B, because the effect of the electric field of conductor A.
As is known to all, when...
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?
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...
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?