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An electron travelling with a spped u al...

An electron travelling with a spped `u` along the positive `x`-axis enters into a region of magnetic field where `B= - B_(0)hat (K) (xgt0)`. It comes out of the region with speed `v` then

A

v=u at `ygt0`

B

v=u at `ylt0`

C

`vgtu` at `ygt0`

D

`vgtu` at `ylt0`

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