4. The Registrar of the Court shall fix a day for the hearing of the application, and the applicant shall cause an office copy of the application containing a note of such day, together with an office copy of the affidavit in support thereof, to be served on every person affected thereby and on any other person that the Court or a Judge may direct. But this rule shall not affect the power of the Court or Judge to grant an application ex parte where the circumstances so require.