Induced current Definition and 188 Threads

Homework Statement The drawing shows a bar magnet falling through a metal ring. In part a the ring is solid all the way around, but in part b it has been cut through. (a) Explain why the motion of the magnet in part a is retarded when the magnet is above the ring and below the ring as well...

Homework Statement A WxH rectangular loop of wire, with resistance R, lies on a table a distance s from a separate long straight wire carrying a current I. If the loop is pulled to the right, parallel to the wire, with the speed v, then what is the magnitude of the current induced on the...

I would like to quantify the EMI on a circuit and I am confused on how to do that. I have two parallel wires that are laying on top of each other. I have tried to calculate the flux linkage and came up with: \Lambda = [l*\muo*I/(2pi)]*ln((d-a)/a) where a=radius of each wire...

Homework Statement A coil with 170 turns, a radius of 5.0 cm, and a resistance of 12 ohms surrounds a solenoid with 230 turns/cm and a radius of 4.7 cm; see the figure. The current in the solenoid changes at a constant rate from 0 to 1.8 A in 0.11 s. Calculate the magnitude and direction of...

Homework Statement A magnet is dropped down each the copper and glass tube. What direction is the induced current in the copper and glass tube respectively? a)clockwise, clockwise b)clockwise, no induced current c)counter clockwise, clockwise d)counter clockwise, no induced current...

Homework Statement The two solenoids in the figure are coaxial and fairly close to each other. While the resistance of the variable resistor in the left-hand solenoid is increased at a constant rate, the induced current through the resistor R will A - flow from a to b. B - flow from...

Will this work in principal? When a current is induced into a coil, by way of a permanent magnet, the said coil will react in producing its' own flux field. Can the flux field produced further induce a current in, let's say, a separate/independent closed loop? Thanks

Hello. 3) A step up transformer increases the mains voltage of 230V to 5000V. a) calculate the ratio Number of primary turns/Number of secondary Turns I know the formula input voltage/output voltage = Primary turn/ Secondary Turns So i did 230/5000 = 0.046. This as a fraction is...

Homework Statement A square loop, 5.3 m on a side, is made of copper wire, 0.9 mm in radius. A 3.2 T magnetic field, perpindicular to the loop is increasing at the rate of 0.29 T/s. The resistivity of copper is 1.7 x 10^-8 ohm*m. Find the induced current. Answer in units of A. Homework...

Homework Statement a single square loop of high resistivity wire ( rho = 10^-6 ohm-meters) is placed in a constant magnetic field B of 0.3 Teslas and oriented so that the axis of rotation of the loop is perpendicular to B and in the plane of the loop. the loop rotates with an angular frequency...

Say we have an induced circuit. My book states that we cannot use the loop rule on an induced circuit because we cannot define a potential difference in the circuit. If the potential difference is undefined how can current exist? There's probably a really obvious answer, but I'm not seeing it.

The circuit is shown below: Find the current through section PQ of length a = 65.0cm. The circuit is located in a magnetic field whose magnitude varies with time according to the expression B = (1.00 x 10^-3T/s)t. Assume the resistance per length of the wire is 0.100 Ohm/meter...

[SOLVED] Induced Current Homework Statement If I have a scenario where one coil is insider another, in which of the following cases will the induced current in the outer coil be the greater? The Attempt at a Solution I would say when the current in the inner coil is increasing rapidly, but I...

ometimes people say that if you moving while lighting, there will be current induced in you, and you'll die, is it correct, and if so how the electrical circuit is closed? (They say if lighting strikes near you, from the electrical field, if you move, there will be induced current in you)

A 10-cm-wide, zero-resistance slide wire is pushed toward a 2.0 ohm resistor at a steady speed of 0.50 m/s. The magnetic field strength is 0.50 T. How much power does the pushing force, 6.25*10^-4 supply to the wire? What is the magnitude of the induced current? I got 3.13*10^-4 for the...

Just need to know if current goes from x to y or y to x. using right hand rule with my thumb pointing towards y and my fingers pointing down (in direction of flux lines) and my palm pointing in direction of force which is straight into the magnet indicates current is in the direction of my...

Homework Statement 15. According to Lenz's law, the direction of an induced current in a conductor due to a change in the magnetic field near the conductor will be that which tends to produce which of the following effects? a. Enhance the effect which produces it b...

The component of the external magnetic field along the central axis of a 50−turn coil of radius 5.0 cm increases from 0 to 1.0 T in 4.3 s. (a) If the resistance of the coil is 2.9 Ω, what is the magnitude of the induced current in the coil? (b) What is the direction of the current if the axial...

Homework Statement The magnetic field perpendicular to a circular loop of wire 23 cm in diameter is changed from +0.52 T to -0.45 T in 175 ms, where + means the field points away from an observer and - toward the observer. Homework Equations (pardon me with the equations, I am LaTeX...

question In a particular experiment a long length of copper wire of very low resistance is rotated by two students. The ends of the wire are connected to a galvanometer, G, and a current is detected. Which of the following is LEAST likely to affect the amount of current produced? (A) The...

Here is a question I have on a practice exam that I am having a littel trouble with. A plane loop of wire consisting of a single turn if radius 5cm is perpendicular to a magnetic field that increases uniformly in magnitude from 0.5T to 2.5T in 1.5 seconds what is the resluting indiced current if...

An aluminum ring of radius 5 cm and resistance 0.003 ohms is placed around the center of a long air-core solenoid with 1000 turns per meter and a smaller radius of 3 cm. If the current in the solenoid is increasing at a constant rate of 270 A/s, what is the induced current in the ring? B=...

I'd really appreciate some help with the following questions. Q1) What is the direct of the induced current in the circular loop due to the current shown in each part of the following fig?Have attached pics of 2 questions. The one on top has I increasing and one on the bottom has I decreasing...

In my figure, the whole circuit is being pulled to the right. AD experiences no change in magnetic field. Why do we apply the Fleming's right hand rule on the loop AD instead of BC? And, if the whole circuit is moving in the uniform magnetic field, if the shape of the circuit is like the...

Hi guys. I have a physics exam coming up in about 4 days. I have tried to learn how to identify the direction of induced current. But still I have to guess the direction which is not helpfull. I was wondering if you could give me a link that illustrates how to identfy the direction or perhaps...

I'm working on a question that I could use some help on. The problem basically says there is a solenoid with a current running through it given by an equation. There is a wire that is coaxial with and surrounding the solenoid, and the wire makes two loops around the solenoid. A resistance for...

would increasing the speed at which magnet passes through a coil Increase,Reduce or does not change the amount of electromagnetic induction? cheers personally I would go with increase but want to see if I am right

I am really really hoping that the answer is wrong in the back of my book otherwise my entire basis for electricity/magnetism will be shattered :cry: Basically, there is a picture of a magnetic field going into the page, and there is a coiled loop within this magnetic field. If the...

In mutual induction, how can we increase the induced current, not e.m.f.?

With RHR-1, if the rod moves to the right in a field coming into the page, the force will move positive charge up (in reality move negative electrons down) in the rod, and induce a current but why is the current counter clockwise?

I've been having trouble with the solution my book (and the solution manual) gives for a problem. Basically, there are two inductors (wire coils): one is on the left, hooked to a battery and a switch. Then there's one to the right of it, hooked to only a resistor. The left switch is closed...

If a switch of a circuit system of a wire loop is open, then no current flows. There would also be no magnetic flux and induced current if it remains open, right? What is the difference between current and induced current? I know the latter arises from a change in the magnetic field, but what...

This one is really getting to me. Find the current through section PQ (the middle column of the circuit) of length a, a =.65 m. The circuit is located in a magnetic field whose magnitude varies with time according to the expression B(t) = .001t. Assume the resistance per length of wire is...

I been trying to work out these problems for the past two days but cannot come up with a solution. If anyone can help that would be greatly appreciated. 1) A 3.80-g bullet moves with a speed of 180m/s perpendicular to the Earth’s magnetic field of 5.00 X 10-5 T. If the bullet possesses a net...

Given a cylinder of length L, radius a and conductivity sigma, how does one find the induced currenty density (J) as a function of p when a magnetic field B is applied? Where p is the distance from the axis of the cylinder and B is applied along the axis of the cylinder, B = Bosin(wt)...

Can anyone help me to do this problem. Thanks in advance. A closed wire loop in the form of a square of side 4.0cm is mounted with its plane horizontal. The loop has a resistance of 2.0*10^(-3) ohm. The loop is situated in the magnetic field of strength 0.7 T directed vertically downwards...

It's sunday night and I have another prelab to do. I wrote down all the answers I thought were correct but I'd like a little confirmation on these. See attached picture for the setup. The red lines indicate parts where the coil is looped away from the view and the black would be parts of the...

by faraday's law induced current in a conducting loop is caused by changes in magnetic flux through that loop.. now, if you move a conducting loop through uniform magnetic field (fixed magnitude and direction) there is an induced current even though there is (apparently) no change in magnetic...