Moving Charge in a Magnetic Field question from JEE Main 2025 (22 Jan, Shift 2)

A proton is moving undeflected in a region of crossed electric and magnetic fields at a constant speed of $2 \times 10^{5}\text{ ms}^{-1}$. When the electric field is switched off, the proton moves along a circular path of radius 2 cm. The magnitude of electric field is $x \times 10^{4}\text{ N/C}$. The value of $x$ is _________. Take the mass of the proton $= 1.6 \times 10^{-27}\text{ kg}$.