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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > An electron moving with a speed u along the positive x-axis at y=0 enters a region of uniform magnetic field which exists to the right of y-axis. The electron exits from the region after some time with the speed v at coordinate y, then

An electron moving with a speed u along the positive x-axis at y=0 enters a region of uniform magnetic field which exists to the right of y-axis. The electron exits from the region after some time with the speed v at coordinate y, then

An electron is launched with velocity v in a uniform magnetic field B. The angle θ between v and B lies between 0 and π/2. Its velocity vector v returns to its initial value in a time interval of