Question

Which of the following particles will experience maximum magnetic force (magnitude) when projected with the same velocity perpendicular to a magnetic field?

Options

• Electron

• Proton

• He⁺

•  Li⁺⁺

Answer 1

Li⁺⁺

Force on a moving charged particle,
F = qVBsin θ
​As velocity V and magnetic field B are constant,  and angle between the magnetic field and charged particle is 90° , the only thing on which force F depends is charge q.
Now, the charge on Li⁺⁺  charge on electron, proton or He⁺ . So the force is maximum for Li⁺⁺.