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By taking into account the magnetic field in the extended quantum moleculardynamics model (EQMD), we analyzed its effects on giant dipole resonance (GDR)by studying the responses and strengths of the dipole moments. The selectedsystem is the $^{40}$Ca nucleus which is excited through the Coulombinteraction by $^{16}$O. Particle acceleration term in Li\'enard-Wiechertpotential is discussed which, however, has small impact on magnetic field. Thepeak energy, strength and width of GDR, temperature, and angular momentum of$^{40}$Ca as a function of beam energy are investigated. It is found that themagnetic field enhances the peak energy, strength and width of GDR which is notonly due to the temperature effects but also due to the enhancement of theangular momentum of nucleus. At beam energy {E} $>$ 200 MeV/nucleon, magneticfield maintains a constant value for the strength of GDR. The work sheds lighton examining important roles of the magnetic field on nuclear structure inlow-intermediate energy heavy-ion collisions.

Impact of magnetic field on giant dipole resonance of $^{40}$Ca using the EQMD model