Questions
A particle having a mass of 0.5 g carries a charge of . The particle is given an initial horizontal velocity of . To keep the particle moving in a horizontal direction
detailed solution
Correct option is A
In the absence of a magnetic field, the particle will experience gravitational force mg. As a result, the particle will not continue moving in the horizontal direction but will describe a parabolic path. So, a magnetic field must be present and its direction must be perpendicular to the direction of the velocity. The magnetic force experienced by the particle is given by F→=q(v→×B→).The magnitude of the force is F=qvBsinθ. If the particle is to move in the horizontal direction, this force must balance the force of gravity, i.e., mg=qvBsinθThe minimum value of B corresponds to sinθ=1 or θ=90∘. Thus, mg=qvBor B=mgqv=0.5×10−3×9.82.5×10−8×6×104=3.27THence, the correct options are (1) and (3).Talk to our academic expert!
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