Two charged particle $A$ and $B$ each of charge $+e$ and masses $12$ $amu$ and $13$ $amu$ respectively follow a circular trajectory in chamber $X$ after the velocity selector as shown in the figure. Both particles enter the velocity selector with speed $1.5 \times 10^6 \,ms^{-1}.$ A uniform magnetic field of strength $1.0$ $T$ is maintained within the chamber $X$ and in the velocity selector.
Two charged particle $A$ and $B$ each of charge $+e$ and masses $12$ $amu$ and $13$ $amu$ respectively follow a circular trajectory in chamber $X$ after the velocity selector as shown in the figure. Both particles enter the velocity selector with speed $1.5 \times 10^6 \,ms^{-1}.$ A uniform magnetic field of strength $1.0$ $T$ is maintained within the chamber $X$ and in the velocity selector.
- A
Electric field across the conducting plate of the velocity selector is $- 10^6\, NC^{-1} \hat i$ .
- B
Electric field across the conducting plate of the velocity selector is $10^6 \,NC^{-1} \hat i$ .
- C
The ratio $r_A$/ $r_B$ of the radii of the circular paths for the two particles is $12/13.$
- D
The ratio $r_A$ $/r_B$ of the radii of the circular paths for the two particles is $13/12$ .
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