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  4. An electron moving with a speed u along the positive x-axis at y = 0 enters a region of uniform magnetic field B=-B0 k which exists to the right of v-axis. The electron exits from the region after sometime with the speed v at coordinate y, then

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Q. An electron moving with a speed $u$ along the positive x-axis at $y = 0$ enters a region of uniform magnetic field $B=-B_0 k$ which exists to the right of $v$-axis. The electron exits from the region after sometime with the speed $v$ at coordinate $y$, thenPhysics Question Image

IIT JEEIIT JEE 2004Moving Charges and Magnetism

Solution:

Magnetic force does not change the speed of charged particle.
Hence, v = u. Further magnetic field on the electron in the given condition is along negative y-axis in the starting. Or it describes a circular path in clockwise direction. Hence, when it exits from the field, y < 0