Question

In Thomson mass spectrograph E→⊥B→ then the velocity of undeflected electron beam will be _______​

Answer 1

velocity = E/B therefore option 1 is the right answer

Answer 2

In Thomson mass spectrograph E→⊥B→ then the velocity of undeflected electron beam will be E/B

Explanation:

• A force of qE will be making acceleration of the charges due to the passing of a charged particle(q)  through the electric field region with a magnitude E.
• When the charged particle passes through the electric field whose magnitude is E then qE will be the force experienced by the electric charge.
• When the  same charge passes through the crossed magnetic field B, then it experience a magnetic force of qvB and here v will be the charge's velocity.
• When the magnitude of the two forces becomes equal then
• qE=qvB⟹v=E/B

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