barF=abari+3barj+6 bark and bar r=2bari-6 barj-12 bark. The value of a. for which the angular momentum is conserved is

barF=abari+3barj+6 bark and bar r=2bari-6 barj-12 bark. The value of a

1.	barF=abari+3barj+6 bark and bar r=2bari-6 barj-12 bark. The value of a. for which the angular momentum is conserved is
Answer» `-1` 0 1 2 Answer :A