$(A)\;200 m \\ (B)\;20 m \\ (C)\;60 m \\ (D)\;300 m $

$a_x =\large\frac{qE}{m}=\large\frac{1 \times 10^{-6} \times 10^7}{1}$

$\qquad =10\;ms^{-2}$

Time of flight $t= \large\frac{2 u \sin \theta}{g}$

=> $t= \large\frac{2 \times 10}{10} \times \large\frac{1}{\sqrt 2}$

=> $\quad= \sqrt 2 sec$

$Range = U \times t +\large\frac{1}{2} $$ a \times t^2$

$\qquad= 10 \times \large\frac{1}{\sqrt 2} $$ \times \sqrt 2 +\large\frac{1}{2}$$ \times 10 \times (\sqrt 2)^2$

$\qquad= 20 m$

Hence B is the correct answer.

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