A charge q is moving with velocity in the presence of both electric field $\vec E$ and magnetic field $\vec B$. If velocity ($\vec v$), electric field ($\vec E$) and the magnetic field ($\vec B$)are mutually perpendicular. The charge will pass through the field undeflected if:

$v=\frac{E}{B}$ $v=\frac{B}{E}$ $v=EB$ $E=B$

$v=\frac{E}{B}$

The correct answer is Option (1) → $v=\frac{E}{B}$