Induced Definition and 977 Threads

say there is an infinite grounded conducting plane and a point charge of charge q is above it. the induced charge on the plane is -q and i know how to find this using the method of images to find the potential and then finding and integrating the charge density, but my text says that it should...

1)A car moves on a plane road. The induced e.m.f in the axle connecting the 2 wheels is maximum when it moves: a)eastward at the equator b)westward at the equator c)eastward in the latitude 45 degrees d)at the poles I analyzed in the following way: The induced e.m.f depends on both...

In chapter 10 section 3 volume 2 of the Feynman lectures on physics, there is a passage that I can't force myself to agree with. He says, talking about the polarization vector of dielectrics, Can someone explain this perhaps differently? I really don't see how a non-uniform polarisation...

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...

Hello, Does anyone know what is the circulation that gives the minimum induced drag in a biplane? Is it elliptical like a single wing? Thanks

Hello, I'm stuck (again) on a physics problem. The problem: Early in 1981 the Francis Bitter National Magnet Laboratory at M.I.T. commenced operation of a 3.3 cm diameter cylindrical magnet, which produces a 30 T field, then the world's largest steady-state field. The field magnitude can...

average emf is it same as induced emf?? Q: a 25-turn circular coil of wire has diameter 1.00m. it is placed with its axis along the direction of the earth'smagneticfield of 50.o uT, and then in 0.200s it is flipped 180 degrees. an average emf of what magnitude is generated in the coil? N =...

Hi, I'm working on making a coil and I was wondering if there are some nifty equations out there to predict how much power the coils can make under a changing magnetic field of X gauss. I am going to be using 1 inch of a 3/8" x 2.25" bolt to wind my coil onto and I will be exposing it to a...

Hi, I'm working on making a coil and I was wondering if there are some nifty equations out there to predict how much power the coils can make under a changing magnetic field of X gauss. I am going to be using 1 inch of a 3/8" x 2.25" bolt to wind my coil onto and I will be exposing it to a...

Is it possible to create/improve superconductivity (and/or increase Tc) by pumping in coherent phonons with proper frequency (kind of phonon laser)?

HELP! Induced Voltage question Here it is: Coil has 10 turns and shaped in an elipse (A = pie ab), having a major axis of 10 cm (10 X 10^-2 m) and minor axis 4 cm (4 X 10^-2m). Coil rotates 100 rpm in a region in which the magnitude of the Earth's magnetic field is 55 microT. What is max...

This problem is difficult to describe, so I'll post a picture. http://img71.imageshack.us/my.php?image=pic1ik.gif The figure above shows a rod of length L caused to move at a constant speed v along horizontal conducting rails. The magnetic field B (the magnitude and direction of which are...

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...

A 1 m long large coil with a radius of 15.2 cm and 280 turns surrounds a 7.6 m long solenoid with a radius of 5.2 cm and 3200 turns. The current in the solenoid changes as I=I_0 sin (2\pi f t) where I_0= 30 A and f=60 Hz.Inside solenoid has 3200 turns and outside coil has 3200 turns. The...

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=...

A 5.97 m long steel beam is accidentally dropped by a construction crane from a height of 6.82 m. The horizontal component of the Earth's magnetic field over the region is 12.2 \mu T. The acceleration of gravity is 9.8 m/s^2. What is the induced emf in the beam just before impact with the Earth...

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...

How can the electric polarization be induced by the strain gradient? It is said in some papers the strain gradient can induce electric polarization in solid materials. Why can it happen? Who can explain this phenomenon to me?

A magnetic field with the time dependence shown in Figure 23-38 is at right angles to a 181 turn circular coil with a diameter of 3.91 cm. What is the induced emf in the coil at each of the following times? (a) t = 2.50 ms 0 V (b) t = 7.50 ms (c) t = 15.0 ms...

Here is the question i am working on: An AM radio station broadcasts with average power 4000 W in all directions. A dipole receiving antenna 65 cm long is at a location 4 miles from the transmitter. Compute the amplitude of the emp that is induced be this signal between the ends of the...

i am trying to solve for the induced current for the following situation: a magnetic dipole, \vec{m}=m_{0}\hat{z} moving with constant velocity coaxially with thin conducting ring. the ring has a resistance r and self-inductance L. what I've done is take the magnetic field of the dipole...

What would be the change of the induced emf in the secondary coil of a two coil system ( without ferromagnetic core ) if both the amplitude and the frequency of the current in the primary coil would double?: emf would stay the same emf would be halved emf would be 4 times larger...

1] A square loop of wire, with sides of length 'a' lies in the first quadrant of the xy-plane, with one corner at the origin. In this region there is a non-uniform time-dependent magnetic field \vec B (y,t) = ky^3t^2\hat z. Find the induced emf in the loop.I applied the flux rule here...

Endnote 30.37 of Penrose's book The Road to Reality briefly outlines what Penrose calls "a more rigous justification" for his graviationally induced state reduction. The endnote concludes with "Details of this argument will be published later." Penrose also alludes to this argument in a...

Hello, I am new here. I was hoping to get some help with a problem. I need to find the Induced Voltage in a coil in terms of the number of coils N, the length l, and time t. I think when all said and done the equation should look close to: NlcB0*sqrt(1-cos(kl)), which is the induced...

If we have a loop with radius 12 cm that lies in a uniform magnetic field of 1.5T. The magnetic field is in the positive z direction and the loop lies in the horizontal xy-plane. Now if the loop is removed from the field in a time interval of 2.0x10^-3 s what will the average induced emf be...

Excuse me, can anyone teach me how to calculate the induced magnetic moment of steel, given the applied magnetic field?

I'm reposting this because my homework is due in an hour and I still have not received help on how to solve this. I understand now that the the loop is equal to one. But could someone be generous enough to explain to me what the area is on problem 2 and 3 and why .503 is wrong for question 1...

I'm having a lot of trouble with the following questions. I was wondering if someone could steer me in the right direction and tell me what I'm doing wrong. I suppose my biggest problem is I don't understand how to do these without knowing the number of turns in the coil. Here's what I've done...

An elastic conducting material is stretched into a circular loop of 11.0 cm radius. It is placed with its plane perpendicular to a uniform 0.900 T magnetic field. When released, the radius of the loop starts to shrink at an instantaneous rate of 80.0 cm/s. What emf is induced in the loop at that...

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...

Suppose i have a wooden ring and a time varying magnetic field is passed through it. Then will there be induced emf.

The Euclidean metric, d, is defined by: d(x, y) = \left [\sum _{i = 1} ^n |x_i - y_i|^2\right ]^{1/2} Define metrics dp for each p in {1, 2, 3, ...} as follows: d_p(x,y) = \left [\sum _{i = 1} ^n |x_i - y_i|^p\right ]^{1/p} Prove that each dp induces the same topology as the...

Hey I'm wondering if someone can help me out with this question. Q: In order to measure the magnetic fields produced by the power lines carrying 50Hz alternating current, a coil consisting of 1500 turns of area 5cm^2 as constructed. Suppose that there is a single power line carrying a...

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...

Here is the problem: A coil containing 590 turns with radius 3.85 cm, is placed in a uniform magnetic field that varies with time according to B=( 1.20×10−2 T\s)t+( 3.40×10−5 T\s^4)t^4. The coil is connected to a resistor of resistance 690 Ohms, and its plane is perpendicular to the magnetic...

If a copper rod is approaching an uniform magnetic field, what's the direction of the induced current?

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

Consider the following problem: There is a uniform magnetic field pointing into the page. A set of rails is placed horizontally inside the field. A metal rod can slide freely on the rails, when we apply a force to move the rod to the right, is there any induced current in the rod when moving...

Hi, Say I have two inner product spaces, V and W. What is the definition of their tensor product? Is this product naturally always an inner product space? Thank! :smile:

1.Will a charge be induced on a plastic-made object if a charged metal is put near it? 2.Is the sharing of charge between two conductor(placed on a insulator) is considered as a current? I think charge can be induced similar to the way in which charged is induced in water. But, I am not...

Can someone check my equation for flux. Thanks A rectangular loop in the z-y plane is situated at t = 0 at the points (x=1,z=0), (x=1,z=5), (x=4,z=5), and (x=4,z=0). The rod of the loop with end points (x=4,z=0), and (x=4,z=5) is moving in the x-direction with a velocity v=5\vec{i}m/s while...

Hello. I am studying for my final and I can't remember how to find the induced magnetic field. I need it because, in my right hand rules handout that i must know, it says put your thumb in the direction of the induced magnetic field and you will curl your fingers into the direction of the...

Here's the problem: Can someone help me start it off? A long straight solenoid of cross-sectional area 6 cm^2 is wound with ten turns of wire per centimeter, and the windings carry a current of 0.25 A. A secondary winding of two turns encircles the solenoid. When the primary circuit is...

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?

Electromagnetism -- induced EMF Please help :) I'm just trying to grasp the whole ... induced EMF concept ... please, anyone?! Also ... breaking the field lines?

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...