Lecture 11: Vector Calculus I
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1 1. Key points Scalar and vector fields Gradient and directional derivative Laplacian Maple Derivatives VectorCalculus package SetCoordinates Vector Norm DotProduct Gradient, Del, Nabla Laplacian evalvf plots package plot3d fieldplot fieldplot3d display 2. Vectors as a function of time Lecture 11: Vector Calculus I where,, and are unit vectors along,, and axes, respectively. Time derivative of time-dependent vectors. If we have a vector, then its time derivative is given by Example 1 Suppose that a particle moving in a trajectory acceleration are. Its velocity and Using Maple
2 We use the Cartesian coordinates. Define a position vector as a function of t Define the velocity vector Define the acceleration (1) (2) (3) Remark: In non-inertial frames such as rotating frame, the base vectors, and are timedependent. Exercise 1 If the position vector is, find its velocity and acceleration. Answer We use the Cartesian coordinates. Define the position vector: Calculate the velocity:
3 Calculate the acceleration: Show the results: 3. Scalar fields and Vector fields A scalar field takes a scalar value at each point of space and expressed by a scalar function of spatial coordinates, i.e. or. Scalar fields are ubiquitous in physics. Foe examples: Potential energy in classical mechanics Electrostatic potential in electromagnetism ) Mass density, charge density Wave function in quantum mechanics A vector field takes a vector value at each point of space and expressed by a vector function of spatial coordinates, i.e. or. Vector field is also ubiquitous in physics. For example, Electric fields. Magnetic field Vector potential Particle current Force field 4. Gradient Consider a scalar field. That is We want to know the change in when the position changed by Now, we change the length of s without changing its direction. That can be done by writing where is a unit vector in the direction of and s is the magnitude of. Then, we have,, and. Since is constant, the change of f is solely determined by s. Using the chain rule, the slope of the surface in the direction of
4 is given by This quantity is called directional derivative in the direction of. The directional derivative has a form of dot product between u and. is a vector field called "gradient of f" and it is also written as grad f. The direction of indicates the direction in which the field increases most rapidly (the largest slope) at point and its magnitude is the slope of the field in that direction at the point. can be viewed as a vector operator (del operator or nabla) defined as f is perpendicular to the surface fconst. and. Suppose lies on the surface defined by fconst,. Hence,. Since is in the surface, is perpendicular to the surface. Example 2 We use the Cartesian coordinates. Find the directional derivative of in the direction of at ( ) Define the direction Normalization Define the scalar field Gradient Directional derivative
5 Evaluate the gradient Example 3 Given the surface, find the unit vector normal to the surface at (1,-2,3). Answer Define the field Example 4: Potential Energy and Force Visualize the potential field force.
6 Use mouse to rotate the image. Example 5: Visualizing the gradient (3D) Define the field. Compute the gradient. Construct a vector field image. The result is plotted in the right panel. Gradient in other coordinates Spherical Coordinates
7 The del operator in the spherical coordinates is defined by Cylindrical coordinates. The del operator in the cylindrical coordinates is defined by. Examples in Physics Force - gradient of potential energy Electric field - gradient of electrostatic potential Fluid velocity gradient of velocity potential Exercise 2 Find the directional derivative of at in the direction of. Plot the gradient of. Answer
8 Directional derivative (Maple remark: DotProduct(u,v) can be expressed in a much simpler form u.v.) At (1,2,-1), we have way: 3) 3 (Another Exercise 3 For the given field, find the vector normal to the surface at the point. Answer
9 5. Laplacian Laplacian operator: div$grad Hence, the Laplacian operator is defined as. When the Laplacian acts on a scalar field, the result is also scalar field. Example 6 Evaluate the gradient of. Define a scalar field Laplacian is another scalar field Examples in Physics
10 Laplace equation Poisson equation Wave equation Diffusion equation/heat equation Schrödinger equation Laplacian in other coordinates Spherical coordinates 1 Rearranging the terms, we obtain the Laplacian in the spherical coordinates Cylindrical coordinates Rearranging the terms, we obtain the Laplacian in the cylindricalcoordinates
11 Exercise 4 Calculate the Laplacian of the following scalar fields. (a) (b) Answer (a) 0 (b) simplify 0 Using the spherical coordinates for (b) Noting that, 0 Remark: The result in part b indicates that the Laplacian is zero everywhere. However, that is not exactly true. At (0,0,0), the field diverges. Thus, the derivative is not defined at the origin. The correct answer to (b) is charge.. This is nothing but Poisson equation for a point 6. Homework: Due 10/10, 11am 11.1 Suppose that the temperature at the point is given in unit K by the equation. Distance is measured in meter. In which direction is the temperature increasing most rapidly at (-1,2,3), and at what rate? Heat flows in the direction of Plot the heat flow using 3D arrows. For a given potential, the force at point is given by. Plot the force field if the potential energy is given by in Joule. Find the force at (2,-1, 1). Distance is measured in meter Find the gradient of and the derivative in the direction of at (1,2,-1). 11.4
12 For a spherical field where. Show that where r is a radial vector.
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