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Q.

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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a

 -1.76  x 108 coulombs/g

b

1.76 x 10-8 coulombs/g

c

 -1.76  x 1010 coulombs/g

d

 -1.76  x 10-10 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
1.6×10-199.1×10-28=-1.76×108 coulombs/grams

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