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An electron moving with a speed u along ...

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

A

`vgtu, ylt0`

B

`v=u, ygt0`

C

`vgtu,ygt0`

D

`v=u,ylt0`

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The correct Answer is:
D
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