When taking an oath in court on the Bible, the right hand is traditionally placed on the Bible.
Typically, you place your right hand on the Bible when taking an oath in court.
When taking an oath in court, you typically raise your right hand.
No, you do not have to put your hand on the Bible in court when swearing to tell the truth. You can choose to affirm instead of swearing on the Bible.
The left hand is placed on the Bible and the right hand is raised.
Tom Robinson places his hand on the Bible and takes an oath to tell the truth before testifying in court.
Raising your right hand in court symbolizes taking an oath to tell the truth. It is a traditional gesture that signifies honesty and sincerity in legal proceedings.
The custom was started by Washington and most of them laid their hand on a Bible while taking the oath. Three exceptions have been noted - T. Roosevelt raised his hand in the air while taking the oath,although I think a Bible was present. Coolidge was sworn in by father at home and did not put his hand on a Bible even though one was on a nearby table. Lyndon Johnson, who had an emergency swear-in in a plane, laid his hand on a book which turned out to be a Catholic prayer book instead of a Bible.
Traditionally, it was your right hand for cultural reasons. I do not believe that Bibles are used for this purpose any more. I personally appeared as a witness twice (in NY) and both times I was asked to swear to tell the truth. No Bible was presented and I was not asked to raise my hand.
Many Christians, including ministers, believe that the Bible teaches that we should not swear at all, on the Bible or otherwise. So they will usually just say they "affirm" that they will tell the truth.
I assume you're asking about the Presidential Oath of Office he read on Tuesday. What he read was not actually FROM the bible, his oath is sworn with his hand ON the bible (in his case, Abraham Lincoln's bible) so he is taking the oath "under the eyes of god" or something like that. Basically it's a sin to lie with your hand on the bible. However, the oath itself is from Article II, Section I from the U.s. Constitution.
For his 2013 swearing in, President Obama used two Bibles-- one that belonged to President Abraham Lincoln, and the other that was used by Dr. Martin Luther King when he was traveling.