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A neutron, a proton, an electron and an a-particle enters a uniform magnetic field with equal velocities. The field is directed along the inward normal to the plane of the paper. Which of these tracks followed are by a - particle.
  • a)
    A
  • b)
    B
  • c)
    C
  • d)
    D
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
A neutron, a proton, an electron and an a-particle enters a uniform ma...
Path C is undeviated. Therefore, it is of neutron's path. From Fleming's left-hand rule magnitude force on positive charge will be leftwards and on negative charge is rightwards. Therefore, tack D is of electron. Among A and B one of proton and other of α−particle ≤.
Further, r=mv/Bq or r∝m/q
Since, (m/q)>(m/q)P
∴rα>rP
or track B is of α particle.
 
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Most Upvoted Answer
A neutron, a proton, an electron and an a-particle enters a uniform ma...
Path C is undeviated. Therefore, it is of neutron's path. From Fleming's left-hand rule magnitude force on positive charge will be leftwards and on negative charge is rightwards. Therefore, tack D is of electron. Among A and B one of proton and other of α−particle ≤.
Further, r=mv/Bq or r∝m/q
Since, (m/q)>(m/q)P
∴rα>rP
or track B is of α particle.
 
Free Test
Community Answer
A neutron, a proton, an electron and an a-particle enters a uniform ma...
C-electron no charge no force
B-electron force in opp direction
A-proton force nearly equal to electron in opposite directon
B-a
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