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We investigate the properties of electromagnetic fields in isobaric$_{44}^{96}\textrm{Ru}+\,_{44}^{96}\textrm{Ru}$ and$_{40}^{96}\textrm{Zr}+\,_{40}^{96}\textrm{Zr}$ collisions at $\sqrt{s}$ = 200GeV by using a multiphase transport model, with special emphasis on thecorrelation between magnetic field direction and participant plane angle$\Psi_{2}$ (or spectator plane angle $\Psi_{2}^{\rm SP}$), i.e. $\langle{\rmcos}\ 2(\Psi_B - \Psi_{2})\rangle$ [or $\langle{\rm cos}\ 2(\Psi_B -\Psi_{2}^{\rm SP})\rangle$]. We confirm that the magnetic fields of$_{44}^{96}\textrm{Ru}+\,_{44}^{96}\textrm{Ru}$ collisions are stronger thanthose of $_{40}^{96}\textrm{Zr}+\,_{40}^{96}\textrm{Zr}$ collisions due totheir larger proton fraction. We find that the deformation of nuclei has anon-negligible effect on $\langle{\rm cos}\ 2(\Psi_B - \Psi_{2})\rangle$especially in peripheral events. Because the magnetic-field direction is morestrongly correlated with $\Psi_{2}^{\rm SP}$ than with $\Psi_{2}$, the relativedifference of the chiral magnetic effect observable with respect to$\Psi_{2}^{\rm SP}$ is expected to be able to reflect much cleaner informationabout the chiral magnetic effect with less influences of deformation.

Impact of magnetic-field fluctuations on measurements of the chiral magnetic effect in collisions of isobaric nuclei