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)

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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)
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question_subject: 

Science

question_exam: 

NDA-II

stats: 

0,4,11,4,7,2,2

keywords: 

{'magnetic field': [0, 0, 0, 6], 'electric field': [0, 0, 0, 1], 'field': [1, 1, 4, 8], 'qfixbj': [0, 0, 0, 1], 'charge parallel': [0, 0, 0, 1], 'velocity': [0, 2, 2, 6], 'qb': [0, 0, 0, 1]}