Q: 18 (NDA-II/2014)

A force F, acting on an electric charge q, in presence of an electro- .magnetic field, moves the charge parallel to the magnetic field with velocity v. Then F is equal to (where B and B are electric field and magnetic field respectively)
question_subject: 
Science
question_year: 
2014
question_exam: 
NDA-II
stats: 
0,56,144,56,72,56,16