AIPMT MAINS 2010 Physics Motion of Charged Particles MCQ Question
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 E̅ and magnetic field B̅. To keep the particle moving in a horizontal direction, it is necessary that
B̅ should be perpendicular to the direction of velocity and E̅ should be along the direction of velocity
Both B̅ and E̅ should be along the direction of velocity
Both B̅ and E̅ are mutually perpendicular and perpendicular to the direction of velocity
B̅ should be along the direction of velocity and E̅ should be perpendicular to the direction of velocity
Correct Answer
Detailed Explanation
For the particle to move in a horizontal direction, the magnetic force q(v × B) and electric force qE should balance each other. This is possible when B̅ and E̅ are mutually perpendicular and perpendicular to the velocity.
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