Biot和 Savart通过设计实验研究电流对磁 极的作用力。 在数学家 Laplace的帮助下,得出B-S定律 (早于安培。 dB=l(xr)与 dl sin成正比,与r2成反比 4元r3 dBldi,构成的平面

奥斯特实验及其意义 相关实验 研究课题

光是什么? 光是一种电磁波,(在真空中的)可见光波长范围是700^400m;红外光为约700 到107nm量级;紫外光1-400nm;比紫外光短的还有X射线、y射线(<0.001nm)等;

电能是应用最广泛的能源； 电磁波的传播实现了信息传递； 电磁学与工程技术各个领域有十分密切的联系； 电磁学的研究在理论方面也很重要

A practical \blue-collar science initially concerned with economics industry, real life problems DYNAMICS--Concerned with the concepts of energy transfers between a system and its environment and the resulting

Chap. 14: Energy in Thermal Processes Solids, liquids or gases have internal energy t Kinetic energy from random motion of molecules translation rotation vibration

Temperature: measure of the motion of the individual atoms and molecules in a gas liquid or solid related to average kinetic energy of constituents High temperature: constituents are moving around energetically

The Simple Pendulum A pendulum is made by suspending a mass m at the end of a string of length L Find the frequency of oscillation for small displacements mg

Today' s topics Fluids in motion Bernouilli’ s equation Viscous fluids Simple oscillations

At ordinary temperature, matter exists in one of three states Solid- has a shape and forms a surface Liquid- has no shape but forms a surface Gas-has no shape and forms no surface What do we mean by“ fluids”? F| uids are“ substances that flow