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Q.

The value of e/m for an electron is

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a

1.00866 c/g

b

$0.005486 c / g$

c

$1.6724 \times 10^{- 24} c / g$

d

$1.78 \times 10^{8} c / g$

answer is A.

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Detailed Solution

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Thomson determined the value of charge to mass ratio as $\frac{e}{m_{e}}$ = 1.758820 $\times 10^{8}$ C g m
where m_e is the mass of electron in kg and e is the magnitude of the charge on the electron in coulomb ‘C’.

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The value of e/m for an electron is