Physics - Magnetism Question with Solution | TestHub

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