Question

derive the relation force f=qvb

Answer 1

We know that,

F = Bil ,

Also we know that, i = q/t,

Substitute this in above formula,

=> F = bql/t,

Now, We also know that Displacement / Time =
Velocity,

But in current carrying conductors l can be displacement as it is straight ,

Now we can rewrite l/t as v , Hope you get it,

Now sub in the second equation,

You will get, F = bvq !!!,

Hope you understand !