In a Thomson set-up for the determination of e/m, electrons accelerated by 2.5 \[kV\] enter the region of crossed electric and magnetic fields of strengths \[3.6\times {{10}^{4}}V{{m}^{-1}}\] and \[1.2\times {{10}^{-3}}T\] respectively and go through undeflected. The measured value of \[e/m\] of the electron is equal to [AMU 2002]

\[1.85\times {{10}^{11}}C\text{-}k{{g}^{-1}}\]

\[1.0\times {{10}^{11}}C\text{-}k{{g}^{-1}}\]

\[1.76\times {{10}^{11}}C\text{-}k{{g}^{-1}}\]

If assertion is true but reason is false.

\[1.85\times {{10}^{11}}C\text{-}k{{g}^{-1}}\]

In a Thomson set-up for the determination of e/m, electrons accelerate

1.	In a Thomson set-up for the determination of e/m, electrons accelerated by 2.5 \[kV\] enter the region of crossed electric and magnetic fields of strengths \[3.6\times {{10}^{4}}V{{m}^{-1}}\] and \[1.2\times {{10}^{-3}}T\] respectively and go through undeflected. The measured value of \[e/m\] of the electron is equal to [AMU 2002]
A.	\[1.0\times {{10}^{11}}C\text{-}k{{g}^{-1}}\]
B.	\[1.76\times {{10}^{11}}C\text{-}k{{g}^{-1}}\]
C.	If assertion is true but reason is false.
D.	\[1.85\times {{10}^{11}}C\text{-}k{{g}^{-1}}\]
Answer» D. \[1.85\times {{10}^{11}}C\text{-}k{{g}^{-1}}\]

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