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99 Percentile Qs Bank for JEE MainPhysicsMagnetic Effects of Current

A charge q enters a region having electric field E and magnetic field B with velocity v . If it continues to move with the same velocity, then which of the following statement is not true

Options

  1. AE B =0
  2. BE v =0
  3. CIf v B =0 , then v = E B B B
  4. Dv E=B

Correct answer

D. v E=B

Step-by-step solution

Lorentz force on electron, F=q( E + v + B ) For regular motion, F=0 E +( v B )=0 E |( v B ) , also [ v B is perpendicular to both v and B ] Now, E v and E B [(i) and (ii) are right] E v =0 and E B =0 Now, if v B =0 v B So, E v B aligned & E = v B & E B =( V B ) B & v B =v B n & ( v B) B = v ( B B ) & v = E B B B & v E = v v B =0 B & aligned [iii) is right] Now, E = v B v E = v v B =0 B So, option (d) is wrong.

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