simulations.objects
Class PointCharge

java.lang.Object
  simulations.objects.BaseObject
      simulations.objects.PointCharge

Direct Known Subclasses:

MovingPointCharge

public class PointCharge

extends BaseObject

Point Charge. This BaseObject calculates the non-relativistic electric and magnetic fields of a stationary point charge

Field Summary

double	m the mass of the point charge
Vec3	p the position of the point charge
double	q the charge of the point charge
double	radius the Pauli radius of the point charge (repulsion always dominates inside this radius).

Constructor Summary

PointCharge(double q, Vec3 p)
constructor for the point charge with radius set to 5.

PointCharge(double q, Vec3 p, double radius)
constructor for the point charge setting Pauli radius

Method Summary

Vec3	Bfield(Vec3 x, Vec3 B) the magnetic field of a stationary point charge (zero)
Vec3	Efield(Vec3 x, Vec3 E) the electric field of a stationary point charge
java.lang.String	toString() writes properties of the point charge to a string

Methods inherited from class simulations.objects.BaseObject

Bfield, Efield, Evolve, Pfield, Pfield

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

q

public double q

the charge of the point charge

m

public double m

the mass of the point charge

radius

public double radius

the Pauli radius of the point charge (repulsion always dominates inside this radius). Radius is the "Pauli" radius, that is the radius at which a r**(-12) repulsion sets in regardless of whether we have electrostatic repulsion or attraction.

p

public Vec3 p

the position of the point charge

Constructor Detail

PointCharge

public PointCharge(double q,
                   Vec3 p,
                   double radius)

constructor for the point charge setting Pauli radius

Parameters:

q - the charge

p - the position

radius - the Pauli radius

PointCharge

public PointCharge(double q,
                   Vec3 p)

constructor for the point charge with radius set to 5.

Parameters:

q - the charge

p - the position

Method Detail

Efield

public Vec3 Efield(Vec3 x,
                   Vec3 E)

the electric field of a stationary point charge

Specified by:

Efield in class BaseObject

Parameters:

x - the position of the observer

E - the electric field at the position of the observer due to the charge at p (calculated)

Returns:

E the electric field at the position of the observer due to the charge at p (calculated)

Bfield

public Vec3 Bfield(Vec3 x,
                   Vec3 B)

the magnetic field of a stationary point charge (zero)

Specified by:

Bfield in class BaseObject

Parameters:

x - the position of the observer

B - the magnetic field at the observer's position if the charge is at p (calculated)

Returns:

zero for a stationary charge

toString

public java.lang.String toString()

writes properties of the point charge to a string