Along with the general election, polling is also Wednesday for 175 assembly seats in Seemandhra region, which will eventually go over to the residuary state of Andhra Pradesh.
About 20 people were injured as clashes erupted between rival party activists in parts of Seemandhra, including Anantapur, Kadapa, Chittoor, Guntur and Prakasam districts. Three police vehicles were set ablaze in Kadapa, a traditional trouble spot during elections.
In Baramulla, the fear of separatists and Tuesday's militant attacks kept most voters indoors. The Peoples Democratic Party (PDP) is trying to snatch the Baramulla seat from the ruling National Conference.
But there was brisk polling in Kashmir's other constituency Ladakh, a Buddhist dominated region. It is also the country's largest parliamentary constituency.
A total of 897 candidates are fighting it out in the 64 seats: Andhra Pradesh (25), Uttar Pradesh (15), Bihar (7), West Bengal (6), Uttarakhand (5), Himachal Pradesh (4) and Jammu and Kashmir (2).