How did Harry Potter find the Horcrux?

Answer 1

Tom Riddle's diary that Harry destroyed in the second book-Dumbledore suspected that it must be a horcrux since it sapped so much energy from Ginny and was able to control her. Dumbledore then realized there must be more horcruxes since the diary was meant to be seen by others, and not kept some place hidden.

Answer 2

Harry became a Horcrux during the First Wizarding War when Voldemort heard about the prophecy about how "the Dark Lord would mark him as his equal" and so on. In response to the prophecy, Voldemort sought out Harry with the intention to kill him. Voldemort killed James Potter out cold and then proceeded to Harry's room. He gave Lily Potter the option to step aside and sacrifice her son to save her own life. But Lily refused to step aside and sacrificed herself to protect Harry. This refusal to step aside and the sacrifice which followed envoked an ancient and powerful magic which bound Harry and Voldemort together, and meant that Voldemort could not touch or harm Harry in anyway, both physical and magical.

When Voldermort attempted to kill Harry, his killing curse rebounded off the protection spell and killed him physically. But due to the instability of his soul from creating several Horcruxes, a part of his soul was blown off during his death and sought out the nearest living thing, which incidentally was Harry. This is how Harry became Voldemort's seventh Horcrux, his accidental Horcrux.

Answer 3

He became a Horcrux because when Voldemort tried to kill Harry, the spell backfired, and when it destroyed Voldemort's body, his soul was already so damaged that a piece of his soul 'broke off' and became attached to Harry.

Answer 4

It's Ravenclaw Diadem or Hufflepuff Cup

the cup he saw in a memory or a house-elf

the diadem he found out since he asked the the Gray Lady, Renoa's (founder) daughter if Renoa had an object with her crest on it

Answer 5

Harry witnesses Voldemort murdering Severus Snape in the Shrieking Shack during the Battle of Hogwarts. As Snape is dying, he tells Harry to take his last thoughts.

When Harry returns to the castle, he goes to the Headmaster's office and while using the Pensieve to view Snape's memories he witnesses a conversation between Dumbledore and Snape. Dumbledore explains that on the night Voldemort murdered Lily and James Potter, a fragment of the Dark Lord's soul broke off the rest when his killing curse rebounded on him and latched itself onto Harry, in his lightning scar, and it is that fragment of soul that enables him to speak parseltongue and see inside Voldemort's mind and that while Harry lives and protects that fragment of soul, Voldemort cannot die.

Hence, Harry is the seventh, unintended Horcux.

Answer 6

He didn't know, he guessed based on Albus Dumbledore's thoughts and what he already knew about Lord Voldemort.

Lord Voldemort always considered Hogwarts home and it was the first place he felt accepted. He had made Slytherin's locket into a Horcrux and Dumbledore guessed that items from the other houses may have been made into Horcruxes.

When Harry, along with Ron Weasley, Hermione Granger and Griphook, broke in Bellatrix Lestrange's vault he told them to look out for either Hufflepuff's cup or Ravenclaw's diadem, when they found the cup it proved Dumbledore's theory.

Answer 7

Voldemort didn't mean to make him one. The killing curse aimed for Harry backfired and shattered Voldemort's soul. The piece of soul then attached to the only living thing in the house; Harry.

Answer 8

Rubeus Hagrid told Harry Potter on his eleventh birthday. The Dursleys had been keeping it from him hoping that if he didn't know, somehow he would stop being a wizard.

Answer 9

As he is one, he can sense the others