he is out
Runner is out. Other runners must return to the base they occupied at the instant of the interference. If the runner was trying to break up a double play, the other runner is also out.
The runner is out as long as the fielder you touches has the ball in his glove
no, but the base runner is out if he is struck by a BATTED ball (but he isn't out if he touches a ball thrown by a fielder)
the fielder has the right to field the ball... the runner is OUT if he interferes in ANY way.
The batter is out, if they hit a ball in the air and a defensive player catches the ball before it touches the ground, in fair or foul territory. If a defensive player has the ball in control and touches a base before the runner, the runner is out. If a defensive player has the ball in control and touches the runner with the ball in their hand or glove, the runner is out.
if he interferes with the runner that would be called obstruction
Runner is out. No. The rule reads the runner is out if physically assisted by the coach. Simply touching the runner is nothing.
MLB Rule 5.08 is pretty clear: If a thrown ball accidentally touches a base coach, or a pitched or thrown ball touches an umpire, the ball is alive and in play. However, if the coach interferes with a thrown ball, the runner is out.
No, unless his knee also touches the ground at the same time.