I thought r.vittal is dong Exp no.2 as follows:
Scenario1: J1 is open and J2 is closed
Output: Bulb lights as normal.
Scenario2: J2 is open and J1 is closed(in picture)
Output: Nothing because there's no potential difference and current flow.
Scenario3: Both J1 and J2 is closed
Output: r.vittal is no more in electrotech. -and I don't think he'll do it because if then he won't be placing J1 over there as his objective behind is to experience different ways of lighting a bulb.
Hope this helps