A) \[30{}^\circ \]
B) \[45{}^\circ \]
C) \[60{}^\circ \]
D) \[120{}^\circ \]
Correct Answer: B
Solution :
\[T\,\sin \theta \,\,=\,\,qE\] \[T\,\,cos\,\theta =mg\] \[\tan \,\theta \,\,\,=\,\,\frac{qE}{mg}\,\,=\,\,\,\frac{39.2\times {{10}^{-10}}\times 20\times {{10}^{3}}}{8\times {{10}^{-6}}\times 9.8}\] \[\tan \,\theta \,\,=\,\,1\] \[\theta \,\,=\,\,45{}^\circ \]You need to login to perform this action.
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