A positive charge particle having change q and mass m has velocity `vecv = v((hati+hatk)/sqrt2)` in the magnetic field B at the origin . Its speed as the function of y is :

Options

A. `sqrt(v^2+(qE)/(2m)y)`
B. `sqrt((B/E)^2+v^2+(qE)/(2m)y) `
C. `sqrt(v^2+(2qE)/my)`
D. None of the above

Answer

C