Physics - Magnetism Question with Solution | TestHub

A proton is moving with a uniform velocity of $10^6{\mathrm{ms}}^{-1}$ along the $Y$ -axis, under the joint action of a magnetic field along $Z$ -axis and an electric field of magnitude $2\times 10^4{\mathrm{Vm}}^{-1}$ along the negative $X$ -axis. If the electric field is switched off, the proton starts moving in a circle. The radius of the circle is nearly given: $\frac{e}{m}$ ratio for proton $=10^4{\mathrm{Ckg}}^{-1}$