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An electron, moving along the \( x \)-axis with an initial
\( \mathrm{P} \) energy of \( 100 \mathrm{eV} \), enters a region of magnetic field
W \( \vec{B}=\left(1.5 \times 10^{-3} \mathrm{~T}\right) \hat{k} \) at \( S \) (see figure). The field extends between \( x=0 \) and \( x=2 \mathrm{~cm} \).
The electron is detected at the point \( Q \) on a screen placed \( 8 \mathrm{~cm} \) away from the point \( S \). The distance \( d \) between \( P \) and \( Q \) (on the screen ) is (electron's charge \( =1.6 \times 10^{-19} \mathrm{C} \), mass of electron \( =9.1 \times 10^{-31} \mathrm{~kg} \) )
(a) \( 11.65 \mathrm{~cm} \)
(b) \( 12.87 \mathrm{~cm} \)
(c) \( 2.25 \mathrm{~cm} \)
(d) \( 1.22 \mathrm{~cm} \) (JEEMain)
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