Metropolitan Magistrate (MM) Sunil Kumar Sharma imposed the cost on Kejriwal and Sisodia while accepting their pleas seeking exemption from personal appearance for the day only.
Kejriwal had sought exemption on the ground that he was in Bangalore for the Lok Sabha election campaigning while Sisodia said he had to rush to Amethi in Uttar Pradesh as AAP leader Kumar Vishwas and other members of the party had sustained injuries after some persons allegedly attacked them there.
The court had on July 24 last year summoned Kejriwal, Sisodia, Bhushan and Ilmi on the criminal defamation complaint filed by Amit in which he had alleged that the AAP leaders had said that he had taken advantage of his father's position to represent a telecom company in court cases here.
During the hearing, Bhushan told the court that the matter should be fixed for hearing after April 9 as the Supreme Court was scheduled to hear the plea filed by Amit on that day.
Advocate Mohit Mathur, who appeared for Amit, opposed the contentions of Bhushan and defence counsel Rahul Mehra saying "we cannot keep waiting.