Magnetic Effects of Current and Magnetism: JEE Main 2025 Physics question

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