$(7)$ Canvas

Consider a proton entering with a velocity $v$ of magnitude $3\mathrm{.}6{10}^5\frac{m}{s}$ in a uniform magnetic field of $1\mathrm{.}2$ T directed out of the page as shown below. Use relevant constant values provided in the equation sheet.

$($A$)$ The magnetic force acting on this charged particle at the location shown in the figure above is

$$

$,$ and it points $$ If the proton is replaced by an electron, the direction of magnetic force acting on the electron will be

$($B$)$ The particle $($proton$)$ will trace a $$ circle of radius $$ mm in the magnetic field due to the magnetic force.

$($C$)$ The work done by the magnetic force on this proton is $$ because