Ampere's Law
The line integral of the magnetic flux around a closed curve is proportional to the algebraic sum of electric currents flowing through that closed curve; or, in differential form curl B = J. This was later modified to add a second term when it was incorporated into Maxwell's equations.

Archimedes' Principle
A body that is submerged in a fluid is buoyed up by a force equal in magnitude to the weight of the fluid that is displaced, and directed upward along a line through the center of gravity of the displaced fluid.

Bernoulli's Equation
In an irrotational fluid, the sum of the static pressure, the weight of the fluid per unit mass times the height, and half the density times the velocity squared is constant throughout the fluid.

Biot-Savart Law
A law which describes the contributions to a magnetic field by an electric current. It is analogous toCoulomb's law.

Centrifugal Pseudoforce
A pseudoforce on an object when it is moving in uniform circular motion. The "force" is directed outward from the center of motion.

Charles' Law (1787)
The volume of an ideal gas at constant pressure is proportional to the thermodynamic temperature of that gas.

Dalton's Law of partial pressures
The total pressure of a mixture of ideal gases is equal to the sum of the partial pressures of its components; that is, the sum of the pressures that each component would exert if it were present alone and occupied the same volume as the mixture.

Doppler Effect
Waves emitted by a moving object as received by an observer will be blueshifted (compressed) if approaching, redshifted (elongated) if receding. It occurs both in sound as well as electromagnetic phenomena.

Einstein Field Equation
The cornerstone of Einstein's general theory of relativity, relating the gravitational tensor G to the stress-energy tensor T by the simple equation G = 8 pi T.

Einstein's Mass-Energy Equation
The energy E of a particle is equal to its mass M times the...

...MagneticFields
PHY 114 Lab Report
10/23/2013
Abstract:
The purpose of this experiment was to surrounding a magnet there is a magneticfield. The magneticfield is analogous to the electric field that exists in the space around electric charges. Like the electric field, the magneticfield has both a magnitude and a direction. The direction of the magneticfield at any point in space is the direction indicated by the north pole of a small compass needle placed at that point. Since electric current is a flow of charge the behavior of a compass needle in the presence of current carrying elements indicates that moving charges produce magneticfield. For a loop of wire consisting of N turns wound close together to form a flat coil with a single radius R, the magneticfield resembles the pattern of a short bar magnet, and at the center of the coil its magnitude is B=N. The direction of the magneticfield at the center of the wire loop can be determined with the help of RIGHT-HAND-RULE. If the thumb of the right hand is pointed in the direction of the current and the curled fingers are placed at the center of the loop, the fingers indicate the direction of the magneticfield....

...MagneticFields
Introduction:
This lab was completed to investigate and map the magneticfield pattern of a single straight conductor by comparing it with the earth’s magneticfield. Quantitatively, the purpose of this lab was to determine the horizontal component of the earth’s magneticfield. Magneticfield and electric currents are naturally closely related because anytime a current runs through a wire, a magneticfield around the wire is created. These magneticfields can be expressed in terms of both magnitude and direction and are, therefore, vector fields. The magnitude of a magneticfield from a straight wire can be determine with the following equation:
B = (μ0I)/(2πy),
where B is the magnitude in units Tesla, μ0 is the permeability of free space with a value of 4π×10-7 Tm/A, I is the current running through the wire in amperes, and y is the perpendicular distance in meters away from the wire to the point where the magneticfield is being measured. Distance away from the wire and the strength of the magneticfield are inversely related. That’s is, as the distance increases, the magneticfield decreases. Additionally, although a Tesla is...

...encyclopedia
Jump to: navigation, search
Electromagnetism is the physics of the electromagnetic field, a field that exerts a force on particles with the property of electric charge and is reciprocally affected by the presence and motion of such particles.
A changing magneticfield produces an electric field (this is the phenomenon of electromagnetic induction, the basis of operation for electrical generators, induction motors, and transformers). Similarly, a changing electric field generates a magneticfield.
The magneticfield is produced by the motion of electric charges, i.e., electric current. The magneticfield causes the magnetic force associated with magnets.
The theoretical implications of electromagnetism led to the development of special relativity by Albert Einstein in 1905; and from this it was shown that magneticfields and electric fields are convertible with relative motion as a four vector and this led to their unification as electromagnetism.
See also: history of electromagnetism and Magnetism
While preparing for an evening lecture on 21 April 1820, Hans Christian Ørsted developed an experiment that provided surprising evidence. As he was setting up his materials, he noticed a compass needle deflected from...

...the balloon is charged A) positively. B) negatively. C) either positively or negatively. D) None of the above choices are correct. 13) In an ac circuit, the electric field A) changes magnitude and direction with time. B) is everywhere the same. C) increases via the inverse square law. D) is non-existent. E) none of these 14) The electric power of a lamp that carries 2 A at 120 V is A) 2 watts. B) 20 watts. C) 240 watts. 15) Which statement is correct? A) Current is the primary cause of voltage. B) Charge flows in a closed circuit. C) Voltage flows through an open or a closed circuit. D) Resistance flows though an open circuit.
12)
13)
14) D) 1/6 watts. E) 60 watts. 15)
2
16) the field surrounding every moving electron is A) always both electric and magnetic. B) always electric but never magnetic. C) always magnetic but never electric D) sometimes magnetic and sometimes electric. E) none of the above 17) Magnetism is due to the motion of electrons as they A) move around the nucleus. B) spin on their axes. C) Choices A and B are both correct. D) None of the above choices are correct. 18) If a steady magneticfield exerts a force on a moving charge, that force is directed A) in the direction of the field. B) opposite the direction of the field. C) at right angles to the direction of the field. 19)...

...GUIDE QUESTIONS
1. What happens to the distribution of magnetic flux lines when the iron ring was placed in between the U-magnets?
The distribution of magnetic flux lines when the iron ring is placed in between the magnets, the iron ring is included in the distribution of flux lines. Instead of connecting to the other pole, the ring affects its distribution and some of it is attracted to the iron ring.
2. How does changing the current affect themagnetic force on a wire suspended in a magneticfield?
As the current rises, the magnetic force is pushing the magnet away from the current, or pulls the magnet either it is north pole of south pole. The force is increasing as the current increases.
3. What would happen if the magnets in the assembly were not properly arrange, meaning the North Pole of one of the magnets is right next to the S pole of the other magnet?
There will be a change in the distribution of forces, since, the North Pole and South Pole attract each other, and therefore, it will change the magnetic force and have error in the experiment.
4. What is the effect of changing the orientation of the loop of wires in the last part of the experiment? What orientation gives the maximum magnetic force? The minimum force?
The effect of changing the orientation of the loops makes the magnet being repelled or attracted by the current. The maximum...

...thread of equal length repel each other all of these forces are acting
on one of then except:
(a) Tension (b) Gravitational pull (c)* Coulomb attraction force (d)
Repulsive force
D
E
A
C
B
+3mC
-5mC
7. Two charges are separated as shown. Where a third positive charge must
be placed if the force it experiences is to be zero?
(a)* At D (b) At C (c) At E
(d) At B
8. For series of charges in a closed surface within a vacuum,
given that Îo andYe are the electric permitivity and field flux,
Gauss’ law can be stated as
(a) (b) (c) (d)
9. One of the following is not a practical use of a capacitor:
(a) To establishment of electric field of a required pattern.
(b) As oscillatory device in circuit.
(c) Used in time-base circuit to initiate an event at a specific time.
(d) To produce and store charges when electric field is lacking.
10. 2mF and 3mF capacitors are both connected in parallel across
a 100 V supply line. Calculate the charge on the plates of the
capacitors:
(a) 1.5x10-6 C (b) 1.0x10-6 C (c) 5.0x10-4 C (d) 0.7x10-4 C
11. Capacitance of a parallel plate capacitor is in directly
proportional to:
(a) The magnitude of the permittivity of the of the dielectric
within the plates
(b) The magnitude of the surface area of the plates
in the capacitor
(c) Separation...

...
PHYSICS FOR SCIENTIST AND ENGINEERS LABORATORY EXPERIMENTS
EXPERIMENT 5
(Assignment)
EXPERIMENT 5 – MAGNETICFIELDS
OBJECTIVES
1. To study the workings of magneticfields.
2. To determine the North and South poles of magnets and magneticfield lines.
3. To understand the attractive and repulsive forces acting on it.
INTRODUCTION
Electric current is defined as the rate at which charge flows through a surface. As with all quantities defined as a rate, there are two ways to write the definition of electric current.
I =
Δq
Δt
and instantaneous current for those with no fear of calculus
I =
lim
Δq
=
dq
Δt → 0
Δt
dt
The unit of current is the ampere [A], which is named for the French scientist André Marie Ampère(1775-1836).
Since charge is measured in coulombs and time is measured in seconds, an ampère is the same as a coulomb per second.
⎡
⎣
A =
C
⎤
⎦
s
This is an algebraic relation, not a definition. The ampere is a fundamental unit in the International System. Other units are derived from it. Fundamental units are themselves defined by experiment. In the case of the ampere, the experiment is electromagnetic in nature.
A magnet is a material or object that produces a magneticfield. This magneticfield is invisible but is responsible for the...

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