Induced Definition and 925 Threads

Homework Statement A 3 m long large coil with a radius of 15.7 cm and 130 turns surrounds a 7.2 m long solenoid with a radius of 5.7 cm and 4700 turns. The current in the solenoid changes as I=I_0 sin (2\pi f t) where I0= 30 A and f=60 Hz.Inside solenoid has 4700 turns and outside coil has...

Homework Statement A flat loop of wire of area 15.7 cm2 and 1.09 turns is perpendicular to a magnetic field whose magnitude decays in time according to B = 0.5 e−t/7. What is the maximum induced emf? Answer in units of V. Homework Equations \epsilon= \Delta\PhiB/\Deltat \epsilon=...

When we say that a metric space (X,d) induces a topology or "every metric space is a topological space in a natural manner" we mean that: A metric space (X,d) can be seen as a topological space (X,τ) where the topology τ consists of all the open sets in the metric space? Which means that all...

Hi, i m new here n very poor in EE.. just want to ask that, is there any formula for us to calculate voltage induced on a coil if we have the info like the number of turns of the coil n the flux (mWb/sec).. cos i can't get from google as well...sorry for trouble n thanks for ur guiding...

Homework Statement A long solenoid has a diameter of 12.0 cm. When a current i exists in its windings, a uniform magnetic field = 25.0 mT is produced in its interior. By decreasing i, the field is caused to decrease at the rate of 6.30 mT/s. Calculate the magnitude of the induced electric...

Homework Statement A solenoid of length 3.7 cm and diameter 0.95 cm is wound with 160 turns per cm. The current is decreasing at a rate of 38.0 A/s. (a) What is the induced emf in one of the windings? (b) What is the induced emf in the entire solenoid? Homework Equations emf =...

Homework Statement A circular coil with 35 turns of wire and a diameter of 19 cm is placed in a magnetic field given by B(t) = 6 t^2 + 6 t + 2 T where t is time in seconds. The field is perpendicular to the plane of the coil. What is the induced EMF at t = 5 s? Homework EquationsE=-d(magnetic...

If I have a top view of two circular coils of conducting wire lying on a flat surface, what is the direciton of induced current that appears in the smaller coil when the switch in the larger coil is closed? I'm trying to figure out: 1.) which direction the induced current would flow through...

Homework Statement Two infinite grounded parallel conducting planes are separated by a distance d. A point charge q is placed between the planes. Determine the induced surface charge densities as well as the total charges on the two planes. Homework Equations Potential of a point charge...

The whole idea of an electric field induced due to a changing magnetic flux seems to run wildly counterintuitive to me. Consider this set up as shown in my physics textbook. A current carrying solenoid placed along the axis of a circular conducting loop. A changing current through the turns of...

Homework Statement A magnetic field is perpendicular to the plane of a single turn circular coil. The magnitude of the field is changing so that the emf of 0.80 V and a current of 3.2 A are induced in the coil. The wire is then re-formed into a single turn square coil, which is used in the...

[b]1. Derive an equation to find the induced EMF on an inner solenoid by a changing current on an outer solenoid. Homework Equations We're given the equation EoRMS=(No*Ai*(2*pi*f)*(permeability constant)*IiRMS)/Li for the induced EMF on the outer solenoid by a changing current in the...

Homework Statement A spacecraft is in a circular orbit of radius 3.1 X 10^4 km around a 1.9 X 10^30 kg pulsar. The magnetic field of the pulsar at that radial distance is 1.4 X 10^2 T directed perpendicular to the velocity of the spacecraft . The spacecraft is 0.20 km long with a radius...

Homework Statement There is a conductor; a metal pole say, in between a north and south magnets. North on the left, south on the right. The conductor is layed out in such a way that it is perpendicular to the magnetic field lines going from north to south. Let's label the metal poles X for...

Homework Statement A rectangular coil of 200 turns has a length of 200 mm and width 120 mm. The coil rotates with a constant angular speed of 1200 revolutions per minute about an axis through the midpoints of its longer sides in a uniform magnetic field of 2.4 x 10-2 T. Starting from a...

I've just seen induced electric field concepts. Could anyone provide a link, which explains it? I had some rather stupid doubts regarding it: 1.If a circular conductor is placed in a varying magnetic field, then to find the induced electric field, we take the center of the conductor as...

Can someone please explain to me how resonance can be induced into the electrons of an atom using pulsed electrical fields? Can this also be done using photons of a specific wavelength?

one conducting plate is at origin of xy plane. and +q is at distance of d from y-axis in the direction of z axis. then what is induced charge in conducting plate & how charge is distributed on plate?

Hi, Why is there a difference in electric potential from a point on the surface of a stationary magnet to a point on a conductor that is placed underneath a dielectric? I placed some stationary magnets on top of glass or a piece of paper and put some aluminum under it, and touch one end of a...

Would you say the things a person perceives on a drug like LSD are "real"?

A bar magnet is being pulled away from one end of a solenoid, eg N pole of magnet nearest to solenoid. I've learned that the current induced in a solenoid is such that the magnetic field it creates opposes the change in flux through the loop. But what if the solenoid is in an open circuit? Will...

Ok, now I got another question while doing electromagnetic induction questions. I know flux linkage=NBA and in a rotating coil, Flux linkage=NBA cos wt, which differentiated (Faraday's Law) wrt time gives E=NBAw sin wt, where w = angular frequency. However, when the plane of the coil is...

[b]A steel alloy specimen having a rectangular cross section of dimensions 18.8 mm × 3.2 mm (0.7402 in. × 0.1260 in.) has the stress-strain behavior shown in the Figure. If this specimen is subjected to a tensile force of 108900 N (24480 lbf) then (a) Determine the amount of elastic strain...

Homework Statement a tightly wound circular coil has 36.8 turns, each of radius .1m. the uniform magnetic field is in a direction perpendicular to the plane of the coil. the field increased linearly from 0 to .42t in a time of .251s. what is the emf induced in the windings of the coil...

Homework Statement A 1.60 cm x 1.60 cm square loop of wire with resistance 1.10 \times 10^{-2} \Omega is parallel to a long straight wire. The near edge of the loop is 1.10 cm from the wire. The current in the wire is increasing at the rate of 100 A/s Homework Equations I think I have...

Homework Statement A solid conductor travels at 150 m/s across a uniform .045T magnetic field. Which side is positively charged and what is the emf across this block? Homework Equations I actually solved for the emf no problem. I am having difficulty determining which side is...

Homework Statement calculate total induced charge on a charged cylinder. where the surface charge density is given by sigma= 2eEo cos(phi) Homework Equations the total induced charge on the cylinder is Integral of (sigma) da can u calculate this integral fo me ... it very...

Homework Statement 1. Oersted discovered that a curernt carrying wire caused a magnet to move. Why does the magnet move? 2. Ampere discovered that a magnet caused a current carrying wire to move. Why does the wire move? Homework Equations (i) ∫Edl = - dΦ_B/dt (ii) ∫Bdl = Iμ_0 +...

Homework Statement A current is induced in a loop by something happening with current in a long straight wire near the loop. What could be happening? (There are two possibilities. Neither the wire nor the loop is moving.) Homework Equations Ampere's Law Faraday's Law The Attempt...

What is the difference between an induced emf and a back emf? (i) i thought they were the same thing? . . .. .

Please see question at . . . . http://www.flickr.com/photos/37144556@N07/3476115300/sizes/o/ (i) I am not sure which hand rule to use?? I think its the right hand rule, so does that mean the answer to question (i) is clockwise. (ii) is the answer " in a circluar direction perpendicular...

Homework Statement Please look into the attached file. In that you can see a block conductor is moving within the magnetic field which is acting isto the page. What will be the separation of the induced charge? will it be 1 or 2? Homework Equations The Attempt at a Solution By...

Faraday's law says induced emf = - d(flux)/dt If this is applied to a loop where induced emf causes currents, and thus flux itself, do we have to consider that flux (of course we don't if it's constant)? If the external flux has a nonzero second derivative, then the induced emf is...

Homework Statement Two insulated metal spheres of equal sizes are given equal positive charges. The two spheres are brought very close to each other without touching. Draw the new charge distribution on the spheres if one sphere is much larger than the other. Homework Equations...

Two straight conducting rails form a right angle where their ends are joined. A conducting bar in contact with the rails starts at the vertex at time t = 0 and moves with a constant velocity of 7.00 m/s along them, as shown in Fig 31-44. A magnetic field with B = 0.350 T is directed out of the...

Homework Statement The rectangular loop shown has resistance 20.0 mΩ. Determine the induced current in the loop at the instant shown. Answer: 66.7µA http://img264.imageshack.us/img264/7386/picture1nlz.png Homework Equations induced emf = |d(flux)/dt| I = emf / R The...

Homework Statement Homework Equations e=d/dt(BAN) The Attempt at a Solution

Homework Statement Two coils are suspended around a central axis as shown in the figure below. One coil is connected to a resistor with ends labeled a and b. The other coil is connected to a battery E The coils are moving relative to each other as indicated by the velocity vectors v. Use...

What is the difference between "induced" and "influenced" ? Hi I don't understand , is it a different word for same phenomena ? I'm novice to physics. Thanks

Homework Statement Homework Equations l = 0.02 m r = 0.3 m E = \frac{-d\phi}{dt} \phi = BA The Attempt at a Solution A = \pi 0.32^2 - \pi 0.3^2 = 0.0124\pi ...Area "cut" by conductor \phi = 1.5a_r0.0124\pi = 0.0186\pi a_r ...change in flux in one revolution 1600...

Homework Statement A current loop with area A is placed in region II in the x-z plane, centered at the origin. (Below is a view looking down from y > 0.) If the magnitude of the current per unit length in each sheet is increased (the directions stay the same), the induced current in the loop...

O.K, please let me see if I got it right: Let M be an orientable m-manifold with non-empty boundary B. Let p be a point in B , and let {del/delX^1,...,del/delX^(m-1) }_p be a basis for T_pB for every p in a boundary component . Let N be a unit normal field on B . Now, this is the...

Homework Statement http://img27.imageshack.us/img27/1695/asdfgv.th.png Homework Equations Your guess is as good as mine The Attempt at a Solution I have no idea how to even begin this problem. What equations are relevant?

Homework Statement A 800-turn solenoid, 18 cm long, has a diameter of 2.9 cm. A 15-turn coil is wound tightly around the center of the solenoid. If the current in the solenoid increases uniformly from 0 to 3.1 A in 0.28 s, what will be the induced emf in the short coil during this time...

Homework Statement A long straight wire lies below to a circuluar loop of wire. The straight wire is carrying a constant 10A current to the right. What is the magnitude and direction of the current in the circular loop, if its diameter is 1 m and its center is 0.75m away from the wire...

Homework Statement The drawing below shows a circular loop of wire (raadius 0.15m) connected to a power supply. The top loop is directly over the bottom loop, which is not connected to anything. In the picture, the loops are shown parallel with one over the other, with the perspective...

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 Resistance = R Radius = r Angle = theta B = 2cos(2t) Circular wire loop where magnetic field acts at theta degrees with respect to the normal of the wire loop. Find induced current and emf in wire loop. Find induced electric field at radial distance d from center of wire...

(As magnitudes) Faraday's law states that induced emf in a conducting loop by a changing flux, say x, is: emf = dx/dt Now if we have a circuit with the loop in series with wires (which are then tied together), how do I picture the voltages/currents in this circuit? I mean, the actual...

I have a circuit set up like so: All in series, induction coils with internal resistance 22 ohms, attached to a resistor of 40 ohms. When AC current is induced in the coils at a certain rate, the voltage dropped across the resistor is .14 V AC. The current, which should be the same...