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A region has uniform electric and magnet...

A region has uniform electric and magnetic fields along the positive `x`-direction. An electron is fired from the origin at an angle `theta( lt 90^(@))` with the x-axis. It will
(i) move along a helical path of increasing pitch
(ii) move along a helical path of decreasing pitch initially
(iii) return to the `yz` plane at some time
(iv) come to rest momentarily at some position

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