Question

A charge 'q' moves in a region where electric field 'E' and magnetic field 'B' both exit, then on it is :-

Answer 1

ans : q( E + v × B )

A charge q moves in a region where electric field E and magnetic field B both exist then
we should use the Lorentz law,
Fnet = Fe + Fm
where Fe is the force due electric field and Fm is the force due to magnetic field .

we know,
Fe = qE
Fm = q(v × B ) { where v is the velocity of moving charge }

now, Fnet = qE + q(v × B )
Fnet = q( E + v × B )