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Question

Name the scientist who first measured the e/m ratio of an electron.


A

J. J Thomson

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B

James Chadwick

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C

Dalton

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D

Rutherford

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Solution

The correct option is A

J. J Thomson


J.J Thomson was the first scientist who measured charge to mass ratio(e/m) of an electron. When a narrow beam of charged particles are projected at constant speed (v) across a magnetic field in a direction perpendicular to the field, the beam of particles experiences a force, which makes them move in a circular path.


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