幻灯片 1
... (1774-1862) and Felix Savart (1791-1841) were the first to provide a precise analysis of the effect. Biot and Savart announced the Biot-Savart Law which can be used to calculate the magnetic field for a segment of current ...
... (1774-1862) and Felix Savart (1791-1841) were the first to provide a precise analysis of the effect. Biot and Savart announced the Biot-Savart Law which can be used to calculate the magnetic field for a segment of current ...
PHYS_2326_012009
... • Relation between field lines and electric field vectors: a. The direction of the tangent to a field line is the direction of the electric field E at that point b. The number of field lines per unit area is proportional to the magnitude of E: the more field lines the stronger E • Electric field lin ...
... • Relation between field lines and electric field vectors: a. The direction of the tangent to a field line is the direction of the electric field E at that point b. The number of field lines per unit area is proportional to the magnitude of E: the more field lines the stronger E • Electric field lin ...
Useful Equations
... Just as we could integrate over a charge distribution to find the electric field at a given point, we can find electric potential ...
... Just as we could integrate over a charge distribution to find the electric field at a given point, we can find electric potential ...
Electricity
... The current from the induced emf will produce a magnetic field, which will always oppose the original change in the ...
... The current from the induced emf will produce a magnetic field, which will always oppose the original change in the ...
Lecture 7 Extra
... Contains the force unit N for Newton and the unit A is the Ampere, the unit of electric current. With the magnetic permeability established, the electric permittivity takes the value given by the relationship ...
... Contains the force unit N for Newton and the unit A is the Ampere, the unit of electric current. With the magnetic permeability established, the electric permittivity takes the value given by the relationship ...
PHYS 272 Fall 2010 Practice Exam 1
... A formula sheet is provided (see end page). Machine Answer Sheet: Using a pencil, fill in Last Name, First Name, & Middle Initial, plus your 10-digit Purdue University ID number. Enter Instructor (Hirsch), Course (PHYS 272), Date (), and Test (1). You must include your Signature. Fill in circle “A” ...
... A formula sheet is provided (see end page). Machine Answer Sheet: Using a pencil, fill in Last Name, First Name, & Middle Initial, plus your 10-digit Purdue University ID number. Enter Instructor (Hirsch), Course (PHYS 272), Date (), and Test (1). You must include your Signature. Fill in circle “A” ...
Student Text, pp. 360-364
... 2. If so, what is this elementary charge, and what is its magnitude, in coulombs? Lab Exercise 7.5.1, in the Lab Activities section at the end of this chapter, allows you to calculate the elementary charge. To answer these questions, the American Nobel laureate Robert Andrews Millikan (Figure 1) dev ...
... 2. If so, what is this elementary charge, and what is its magnitude, in coulombs? Lab Exercise 7.5.1, in the Lab Activities section at the end of this chapter, allows you to calculate the elementary charge. To answer these questions, the American Nobel laureate Robert Andrews Millikan (Figure 1) dev ...
Chapter 22 – Gauss Law
... surface and the direction of electric flux through surface (inward for -q, outward for +q). - There is a connection between magnitude of net enclosed charge and strength of net “flow” of E. - The net electric flux through the surface of a box is directly proportional to the magnitude of the net char ...
... surface and the direction of electric flux through surface (inward for -q, outward for +q). - There is a connection between magnitude of net enclosed charge and strength of net “flow” of E. - The net electric flux through the surface of a box is directly proportional to the magnitude of the net char ...
Physics 9 Fall 2010 - faculty.ucmerced.edu
... The magnitude of the electric field 20.0 cm from the sphere’s center is 1.88 × 103 N/C. (a) What is the sphere’s volume charge density, ρ? (b) Find the magnitude of the electric field at a distance of 5.00 cm from the sphere’s center. (Hint: use Gauss’s law to figure out the field at this position.) ...
... The magnitude of the electric field 20.0 cm from the sphere’s center is 1.88 × 103 N/C. (a) What is the sphere’s volume charge density, ρ? (b) Find the magnitude of the electric field at a distance of 5.00 cm from the sphere’s center. (Hint: use Gauss’s law to figure out the field at this position.) ...
Physics revision facts
... travel at the same speed and direction as before the collision. Safety features try to minimise injuries 13.5 What is static electricity, how can it be used and what is the connection between static electricity & electric currents? When insulating materials are rubbed together they become electric ...
... travel at the same speed and direction as before the collision. Safety features try to minimise injuries 13.5 What is static electricity, how can it be used and what is the connection between static electricity & electric currents? When insulating materials are rubbed together they become electric ...
Electric charge
Electric charge is the physical property of matter that causes it to experience a force when placed in an electromagnetic field. There are two types of electric charges: positive and negative. Positively charged substances are repelled from other positively charged substances, but attracted to negatively charged substances; negatively charged substances are repelled from negative and attracted to positive. An object is negatively charged if it has an excess of electrons, and is otherwise positively charged or uncharged. The SI derived unit of electric charge is the coulomb (C), although in electrical engineering it is also common to use the ampere-hour (Ah), and in chemistry it is common to use the elementary charge (e) as a unit. The symbol Q is often used to denote charge. The early knowledge of how charged substances interact is now called classical electrodynamics, and is still very accurate if quantum effects do not need to be considered.The electric charge is a fundamental conserved property of some subatomic particles, which determines their electromagnetic interaction. Electrically charged matter is influenced by, and produces, electromagnetic fields. The interaction between a moving charge and an electromagnetic field is the source of the electromagnetic force, which is one of the four fundamental forces (See also: magnetic field).Twentieth-century experiments demonstrated that electric charge is quantized; that is, it comes in integer multiples of individual small units called the elementary charge, e, approximately equal to 6981160200000000000♠1.602×10−19 coulombs (except for particles called quarks, which have charges that are integer multiples of e/3). The proton has a charge of +e, and the electron has a charge of −e. The study of charged particles, and how their interactions are mediated by photons, is called quantum electrodynamics.