A student found e/m using Thomson method for electron. His value was 1/3 rd of the original. He claimed to commit no mistake.

instead of electron he used quark

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he took some mysterious particle

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the electron was moving with relativistic speed

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he just lied

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Solution

The correct option is B the electron was moving with relativistic speed
When an object (electron) moves with a relativistic speed its mass increases, hence reducing the value
$\frac{q}{m}$

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A student found e/m using Thomson method for electron. His value was 1/3 rd of the original. He claimed to commit no mistake.

The correct option is B the electron was moving with relativistic speedWhen an object (electron) moves with a relativistic speed its mass increases, hence reducing the value qm

The correct option is B the electron was moving with relativistic speed
When an object (electron) moves with a relativistic speed its mass increases, hence reducing the value
$\frac{q}{m}$