15. the lagrangian for a particle of charge 'e'in an electromagnetic field is given by (a) t-e+a.v (b) t+eo+a.v (c) t+e0-a.v (d) t-e0-sav

15. The Lagrangian for a particle of charge 'e'in an electromagnetic field is given by (A) T-e+A.V (B) T+eo+A.V (C) T+e0-A.V (D) T-e0-SAV