The ratio of charge to mass of an electron in coulombs per gram was determined by j .j. Thomson. He determined this ratio by measuring the deflection of cathode rays in electric and magnetic fields. What value did he find for this ratio?

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-1.76 x 10^-10 coulombs/g

-1.76 x 10¹⁰ coulombs/g

-1.76 x 10⁸ coulombs/g

1.76 x 10^-8 coulombs/g

answer is A.

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Detailed Solution

Charge of an electron is

=−1.6×10⁻¹⁹C

Mass of electron is

9.1×10⁻³¹kg=9.1×10⁻²⁸g

Thus, Charge/mass ratio is
$\frac{1.6 \times 10^{- 19}}{9.1 \times 10^{- 28}} = - 1.76 \times 10^{8} coulombs / grams$

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