# What is divergence in spherical coordinates?

## What is divergence in spherical coordinates?

The vector (x, y, z) points in the radial direction in spherical coordinates, which we call the direction. Its divergence is 3. It can also be written as or as. A multiplier which will convert its divergence to 0 must therefore have, by the product theorem, a gradient that is multiplied by itself.

**What is gradient in spherical coordinates?**

As an example, we will derive the formula for the gradient in spherical coordinates. Idea: In the Cartesian gradient formula ∇F(x,y,z)=∂F∂xi+∂F∂yj+∂F∂zk, put the Cartesian basis vectors i, j, k in terms of the spherical coordinate basis vectors eρ,eθ,eφ and functions of ρ,θ and φ.

### How do you write in spherical coordinates?

To convert a point from spherical coordinates to cylindrical coordinates, use equations r=ρsinφ,θ=θ, and z=ρcosφ. To convert a point from cylindrical coordinates to spherical coordinates, use equations ρ=√r2+z2,θ=θ, and φ=arccos(z√r2+z2).

**How do you write vectors in spherical coordinates?**

The unit vectors in the spherical coordinate system are functions of position. It is convenient to express them in terms of the spherical coordinates and the unit vectors of the rectangular coordinate system which are not themselves functions of position. r = xˆ x + yˆ y + zˆ z r = ˆ x sin!

## What is dV in cylindrical coordinates?

In cylindrical coordinates, we have dV=rdzdrd(theta), which is the volume of an infinitesimal sector between z and z+dz, r and r+dr, and theta and theta+d(theta). As shown in the picture, the sector is nearly cube-like in shape. The length in the r and z directions is dr and dz, respectively.

**How do you find Laplacian in spherical coordinates?**

∂r∂z=cos(θ),∂θ∂z=−1rsin(θ),∂ϕ∂z=0….derivation of the Laplacian from rectangular to spherical coordinates.

Title | derivation of the Laplacian from rectangular to spherical coordinates |
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Last modified on | 2013-03-22 17:04:57 |

Owner | swapnizzle (13346) |

### How do you calculate Laplacian cylindrical coordinates?

Laplace Equation in Cylindrical Coordinates

- ∇ 2 Φ = 1 r ∂ ∂ r ( r ∂ Φ ∂ r ) + 1 r 2 ∂ 2 Φ ∂ θ 2 + ∂ 2 Φ ∂ z 2 = 0.
- ∇ 2 Φ = 1 r ∂ Φ ∂ r + ∂ 2 Φ ∂ r 2 + 1 r 2 ∂ 2 Φ ∂ θ 2 + ∂ 2 Φ ∂ z 2 = 0.
- 1 R r d R d r + 1 R d 2 R d r 2 + 1 P r 2 d 2 P d θ 2 = λ .

**What is dA in spherical coordinates?**

where dA is an area element taken on the surface of a sphere of radius, r, centered at the origin. We have just shown that the solid angle associated with a sphere is 4π steradians (just as the circle is associated with 2π radians).

## What is the equation of a sphere in spherical coordinates?

A sphere that has the Cartesian equation x2 + y2 + z2 = c2 has the simple equation r = c in spherical coordinates.

**Where are spherical coordinates used?**

Spherical coordinates (r, θ, φ) as often used in mathematics: radial distance r, azimuthal angle θ, and polar angle φ.

### Can spherical coordinate be negative?

But θ can also be negative. A negative value of θ means that the polar axis is rotated clockwise to intersect with P. Thus, the same point can have several polar coordinates. For example, (2, 90) and (2, −270) represent the same point.