Wire Definition and 1000 Threads

Homework Statement (See image) a closed circular wire A lies in the plane of the wire B in the circuit. Deduce the direction. Of the induced current in A when (A) the switch is closed (B) the switch is opened (C) the wire A is raised out of the plane of the paper. Homework EquationsThe...

Homework Statement A length of wire, length l, is clamped at its midpoint. It is then stretched on the right side, with the left side unchanged, to a length of l (the right side has a length l). The original Resistance of the wire was R, what is the new resistance of the wire? Homework...

sorry, really didn't know where to post something like this. But where can i get a hold of a wire of semiconducting material?

Say I connect a wire to a power supply with a voltage V. The wire is a cilinder with a total surface area A, and resistance R. The wire will get hotter and hotter, and the temperature will increase linearly, according to the equation R(T)=R(1+aT). It will give this heat off in the environment to...

Homework Statement A steel wire 2.9mm in diameter stretches by 0.038{\rm \\%} when a mass is suspended from it. The elastic modulus for steel is 2.0×1011N/m2 *that {\rm \\%} value is in my homework, I assumed it was a mistake and was meant to be mm Homework Equations young's module for...

I am trying to calculate what the heat change from room temperature is in a wire loop is. I have the power P, the thermal conductivity K , the radius of the wire "a" and the radius of the loop "r". Using Fourier's Law: P = -KA \frac{\Delta T}{\Delta x} I am unsure what to use as A and...

1. Homework Statement This is for a physics lab I am working on. A flowing current causes the wire to deflect towards the right a certain amount that varies depending on the current strength. I need to derive the equation d=(L/mg)F where -- L is the distance between contact 1 and 2 both of...

Homework Statement [This is the best image I could find] The link on the bottom part of the rails is now removed creating two parallel wires that are not connected (so no longer U shaped but just two rails). Now a wire of length L, mass m and resistance R slides without friction down parallel...

Homework Statement Calculate the magnetic field of a current loop. Compare your numerical results with exact solution above the center of the loop. Investigate the effect of the grid size based on this comparison. Homework Equations dB = u0*I/4pi * (dL * R) / (R^2 + Z^2)^3/2 Bz = u0*I*R^2/ (2...

If i have a current of both negative and positive charges(i know that there is also current from only negative and only positive charges,i'm not confused) along an infinite wire of square cross-section,and the we put a homogeneous magnetic field normal to the current,then a Lorentz force acts on...

What limits the speed of information through a copper wire? What is the speed of signal in optic fibres? Is it faster and why?

Question: A copper wire and steel wire with identical diameters are placed under identical tensions. The frequency of the third resonant mode for the copper wire is found to be the same as the frequency of the fourth resonant mode for the steel wire. If the length of the copper wire is 3.44 m...

Hello all, first time posting here. Just to give a quick background, I'm NOT an electrical engineer; I'm a motorsport mechanic by trade. However, in the motorsport world electrical work typically doesn't go beyond "start replacing parts and see where it goes", so I try to learn as much as I...

Homework Statement Please find it attached. Homework Equations The Attempt at a Solution Ok so at point P the net magnetic field strength is zero, thus if I were to equate the magnetic fields at point P due to the cylinder, and then due to the wire, and sum them together using the...

Homework Statement A wire carrying 1.5 A passes through a region containing a 2.0 T magnetic field. The wire is perpendicular to the field and makes a quarter-circle turn of radius R= 1/ as it passes through the field region as shown below. Find the magnitude and direction of the magnetic force...

Homework Statement A straight, nonconducting plastic wire 9.50cm long carries a charge density of 100 nC/m distributed uniformly along its length. It is lying on a horizontal tabletop. Find the magnitude and direction of the electric field this wire produces at a point 6.00cm directly above...

Greetings !New to the forums. Here expanding my concept of what AC Electricity is My question (correct me if wrong).. If AC power alternates between +,- at a rate of 60Hertz/second and negative is used as -earth- at the AC generator If the hot wire touches the ground would happen? (I think...

Okay so before I get torn to shreds let me say I am coming to the gurus for knowledge because I am severely lacking in it. So here is what I am trying to do. I am trying to figure out how to control the temperature of a wire when coiled or wrapped around a small glass tube. I am using 32 gauge...

What would be the virtual particle force acting on a wire, which go's from say Earth to any part of the universe reseeding away from us at near light speed, or grater ?, would it break, and how would we compute it ? Lachlan

Homework Statement A wire coil of 2 cm with 10 turns is in a magnetic field of 2 T. The field is perpendicular to the plane of each turn of the coil. The coil is wired in series with resistor of 5 Ω. The field drops at a constant rate to 0.0 T in 10 ms. What is the current through the resistor...

Homework Statement In a book discussing a simple electrical circuit it said "If a thick wire is used in the experiment, the current will be extremely high for a very low voltage. The wire can get very hot very quickly". This got me thinking about fuses in plugs. Is the fuse in a plug a thick...

Homework Statement (Just for number 1 only - finding electric field) [/B] Homework Equations dE = k dq/R^2 sin theta = y/R = y / sqrt (a^2 + y^2) dq= lamda*dy The Attempt at a Solution [/B] I'm confused at the point of calculating the integral from -L/2 to L/2. I got the final integral...

The Earth wire carries current to the ground and we walk on the ground and the ground is a good conductor of electricity. So when we walk on the ground then how come we don't feel the current from the Earth wire?

Homework Statement A hanging wire made of an alloy of titanium with diameter 0.5cm is initially 6m long. When a 60kg mass is hung from it, the wire stretches an amount 1.44cm. A mole of titanium has a mass of 48g, and its density is...

Homework Statement :A steel wire of radius 0.4 × 10–3 m and length 1 m is tightly clamped between points A and B which are separated by 1 m and in the same horizontal plane. A mass is hung from the middle point of the wire such that the middle point sags by 2 cm from the original...

I am planning in making a boiling tube that heats up to about 200c without a flame. I was thinking a coil of wire and a 9v battery (portable is always better). How would I make the wire hot - 200c/300c with only a 9v battery.

Homework Statement [/B] Suppose the particle has a charge q = 2.5 μC and is moving with a velocity of magnitude v = 1.0 × 103 m s−1, in a direction parallel to the wire and in the same direction as the current. The particle is at distance d = 1.5 mm from the wire and experiences a force of...

As part of a wire manufacturing process, heavy wire coils are being sprayed with oil to prevent corrosion. Final step is to have these coils dripped to eliminate oil excess. Basic question is; if I where to build a vibration platform/table to do this dripping, what would be a good consideration...

hello,If anyone of you help me in finding specification(diameter of nichrome wire required) for a 2 m nichrome wire to heat up to 65 degree Celsius .Voltage applied is 12 v. I want to use it by coiling it to cylindrical mica sheet to make a smaller heating product.Temperature should not exceed 65.

Homework Statement NUMBER 271 Homework Equations Not Really Sure The Attempt at a Solution No Idea where to start, I looked up the law of Tangents and it seems to do with that. Please help! :) I am also confident that it has to do with equilibrium?

Homework Statement An infinite wire carries current I. I hope the picture works! The vertical arrow shows the direction of current in the wire. The green arrow has length a and ends at point P. What is the magnitude of the magnetic field at point P? Homework Equations dB = (μ/4π) (I dl×r...

Homework Statement Determine the amplitude of a magnetic field in an electromagnetic wave that carries a flux density of 100 mW/cm2. How much current would be required in a long straight wire so that the magnetic field if this same amplitude would be generated at a distance of 1mm from the...

At various lengths and the ends already bent at right angles?

Homework Statement The wire has mass 250g and is tied down at both ends. It has a length of 12.50m and a fundamental frequency of 25.0 Hz. It has linear mass density. Sound travels at 344m/s in air. Calculate the frequency of the sound waves produced when the wire vibrates at its fifth...

Homework Statement A long, straight power line is made from a wire with radius ra = 1.0 cm and carries a line charge density λ = 2.6 μC/m. Assuming there are no other charges present, calculate the potential difference between the surface of the wire and the ground, a distance of rb = 22 m...

Homework Statement Prove in a current carrying wire the magnetic field only has a theta component. Homework Equations ∇ ⋅ B = 0 (dive of magnetic field zero, 2nd Maxwell Eq) ∇ x B = μ J (Ampere's Law, 4th Maxwell Eq) Cylindrical symmetry means B field only dependent on r (distance from z...

Electrons are moving in moves in all sorts of directions, causing the net electric charge to cancel out. But, when you apply a voltage, there's a small amount of electrons that will move towards the direction in the direction of the voltage. This is called the drift speed. Am I right? I read...

If a "normal" looking wire and a resistor are in parallel on a simple circuit diagram, will any current pass through the resistor?

Hey guys, I am building a superconducting magnet. The wire I have is extremely thin, and is flat. To put it more into perceptive it has a width and height. When I wind it into a magnet, it is more like a disk coil, or racetrack coil. Because it has a different geometry than most other...

I have questions based on my understanding on the home electrical system (USA). I am not a student, this is for my personal understanding. My understanding (please bear with me): Electrical power to the house Mains Panel comes from the secondary of the utility company transformer in the form...

Homework Statement consider a horizontal cylindrical tube of cross sectional area A fitted with two frictionless pistons. The piston are connected to each other by an inextensible wire. Initially, the temperature of the gas is To and its pressure is Po which equals the atmospheric pressure...

Homework Statement A rigid uniform horizontal wire PQ of mass M, pivoted at P, carries a constant current I. It rotates with a constant angular speed in a uniform vertical magnetic field B. If the current were switched off, the angular acceleration of the wire in terms of B, M and I would be...

Greetings, folks! I have spent the past six years developing a matching pair of 13"-square heating plates to mount to the inside bottom (front and rear) of a Sun-Mar Excel NE composting toilet drum. The heating plates are necessary to keep the compost in the composting drum between 70º and...

Homework Statement Under tension T the wire has lenghth of m, its length becomes n when the tension is increase to T'. What is the extra energy stored in the wire as a result of this process? Homework Equations E=1/2 Fe[/B]The Attempt at a Solution Extra energy= E(n)-E(m) = 1/2 x (T'n-Tm)...

hi pf! i'm wondering if you can help me with the heat eq for a basic cylinder wire problem. namely, we have a wire with radius ##r_i## and length ##L##and resistance is ##R## and current is ##I##. Thus heat produced $$Q = R I^2 \pi r_i^2 L$$. When using the heat eq, we assume time rate of...

I have a wire used for cutting cheese that gets pushed horizontally into the wire repeatably. Naturally the wires break as the wear. Currently, we just tighten the wire until it seems good but I am unsure how much the pretension in the wire influences the rate the wire breaks. I was looking to...

From the diagram above, there are two types of wires a straight wire and a non-straight wire(zig-zag shaped wire), that are both placed inside a magnetic field(B), and have current flowing in both of them as well. The straight wire will experience a force and will move towards the left as...

Homework Statement An infinite wire carrying a constant current ##I## in the ##\hat{z}## direction is moving in the ##y## direction at a constant speed ##v##. Find the electric field, in the quasistatic approximation, at the instant the wire coincides with the ##z## axis. [Answer...

< Mentor Note -- thread moved to HH from the technical physics forums, so no HH Template is shown > This problem is bugging me since a week so I decided to post this here Suppose we have a wire with some current 'I' and which at a point 'o' spreads radially in all direction along conducting...

I am making an inductor coil out of wire that I removed from a piece of insulated copper wire. The inductor didn't conduct and I checked the conductivity of the coil alone via a multimeter and it didn't conduct any electricity and it is a copper wire so I need to know what is going on here...