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// $Id: G4EqMagElectricField.hh,v 1.9 2006/06/29 18:22:03 gunter Exp $
// GEANT4 tag $Name: geant4-09-03 $
//
//
// class G4EqMagElectricField
//
// Class description:
//
// This is the right-hand side of equation of motion in a combined
// electric and magnetic field.

// History:
// - Created. V.Grichine, 10.11.98
// -------------------------------------------------------------------

#ifndef G4EQMAGELECTRICFIELD_hh
#define G4EQMAGELECTRICFIELD_hh

#include "G4EquationOfMotion.hh"
#include "G4ElectroMagneticField.hh"

class G4EqMagElectricField : public G4EquationOfMotion
{
  public:  // with description

    G4EqMagElectricField(G4ElectroMagneticField *emField )
      : G4EquationOfMotion( emField ) {;}

    ~G4EqMagElectricField() {;} 

    void  SetChargeMomentumMass(G4double particleCharge, // in e+ units
                                G4double MomentumXc,
                                G4double mass);

    void EvaluateRhsGivenB(const G4double y[],
                           const G4double Field[],
                                 G4double dydx[] ) const;
      // Given the value of the electromagnetic field, this function 
      // calculates the value of the derivative dydx.

  private:

    G4double        fElectroMagCof ;
    G4double        fMassCof;
};

#endif
