1. Tardigrade
  2. Question
  3. Physics
  4. A particle having a mass of 10-2 kg carries a charge of 5 × 10-8 C. The particle is given an initial horizontal velocity of 105 ms -1 in the presence of electric field vecE and magnetic field vecB. To keep the particle moving in a horizontal direction, it is necessary that (1) vecB should be perpendicular to the direction of velocity and vecE should be along the direction of velocity (2) Both vecB and vecE should be along the directionof velocity (3) Both vecB and vecE are mutually perpendicular and perpendicular to the direction of velocity. (4) vecB should be along the direction of velocity and vecE should be perpendicular to the direction of velocity Which one of the following pairs of statements is possible?

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Q. A particle having a mass of $10^{-2} kg$ carries a charge of $5 \times 10^{-8} C$. The particle is given an initial horizontal velocity of $10^{5} ms ^{-1}$ in the presence of electric field $\vec{E}$ and magnetic field $\vec{B}$. To keep the particle moving in a horizontal direction, it is necessary that
(1) $\vec{B}$ should be perpendicular to the direction of velocity and $\vec{E}$ should be along the direction of velocity
(2) Both $\vec{B}$ and $\vec{E}$ should be along the directionof velocity
(3) Both $\vec{B}$ and $\vec{E}$ are mutually perpendicular and perpendicular to the direction of velocity.
(4) $\vec{B}$ should be along the direction of velocity and $\vec{E}$ should be perpendicular to the direction of velocity
Which one of the following pairs of statements is possible?

AIPMTAIPMT 2010Moving Charges and Magnetism

Solution:

Both $\vec{B}$ and $\vec{E}$ should be along the direction of velocity and both $\vec{B}$ and $\vec{E}$ are mutually perpendicular and perpendicular to the direction of velocity.