An electron and proton enter a magnetic field perpendicularly. Both have same kinetic energy. Which of the following is true?
Text Solution
Verified by ExpertsThe correct answer is:
B
When a charged particle enters a magnetic field perpendicularly, it moves on a circular path. The required centripetal force is provided by magnetic force.
i.e., magnetic force = Centripetal force
or 
∴ r = 
Now kinetic energy of the particle,
K = 
⇒ mv = 
….(i)
Therefore, Eq. (i) becomes
r = 
or r ∝ 
∴ 
As m e < m p ; so, r e < r p
Hence, trajectory of proton is less curved.
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