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In presence of a magnetic field  and an electric field and an electric field  a particle moves undeflected. Which of the following statements is (are) correct? 
  • a)
    The particle has positive charge, velocity
  • b)
    The particle has positive charge, velocity
  • c)
    The particle has negative charge, velocity =
  • d)
    The particle has negative charge, velocity
Correct answer is option 'B,D'. Can you explain this answer?
Most Upvoted Answer
In presence of a magnetic fieldand an electric fieldand an electric fi...
Lorentz force
F=qE+q(V×B)
particle undeflected so
F=0
qE +q(V×B)=0
q(E+V×B) = 0
E = -V×B.
now given E= -E(k^),B=B(j^)
so
-E(k^) =-V×B(j^)
so V = E/B(i^)
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In presence of a magnetic fieldand an electric fieldand an electric fielda particle moves undeflected.Which of the following statements is (are) correct?a)The particle has positive charge, velocityb)The particle has positive charge, velocityc)The particle has negative charge, velocity =d)The particle has negative charge, velocityCorrect answer is option 'B,D'. Can you explain this answer?
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