z-coordinate of the particle as a function of time after the magnetic field is switched on is
−mvqB[1−cos(qBmt)]
mvqB[1−cos(qBmt)]
−mvqB[1+cos(qBmt)]
mvqB[1+cos(qBmt)]
A
−mvqB[1+cos(qBmt)]
B
−mvqB[1−cos(qBmt)]
C
mvqB[1−cos(qBmt)]
D
mvqB[1+cos(qBmt)]
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Solution
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The particle will travel in a parabolic trajectory OA. Let the time to reach A is t0. ay=−qEm x-coordinate of the point A is x=(2vcosθ)t0
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