Question

How to arrieve at F=qvB?

Answer 1

Sorry I not ideas your question

Answer 2

Hey!!!...Here is ur answer

As we know that..

magnetic force(F)=qvB SinA

where q=charge, v=velocity of particle, B= magnetic field

Since Here A=90°

then

F=qvBSin90°

F=qvB×1

F=qvB

Hope it will help you