Question

Which one of the following is not correct about Lorentz Force?

• A. In presence of electric field $\overline{E}\left(r\right)$ and magnetic field $\overline{B}\left(r\right)$ the force on a moving electric charge is $\overline{F}=q\left[\overline{E}\right(r)+\overrightarrow{v}\times \overline{B}(r\left)\right]$.
• B. The force, due to magnetic field on a negative charge is opposite to that on a positive charge.
• C. The force due to magnetic field become zero if velocity and magnetic field are parallel or antiparallel.
• D. For a static charge the magnetic force is maximum.

Answer 1

The correct option is D For a static charge the magnetic force is maximum.

If charge is not moving then the magnetic force is zero.
Since $\overrightarrow{F_m}=q(\overrightarrow{v}\times \overrightarrow{B})$
As $\overrightarrow{v}=0$, for stationary charge. $\therefore \overrightarrow{F_m}=0$

So in this case minimum force will act on the charge partical.

Option D