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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

`v gt u, y lt 0`

B

`v = u, y gt 0`

C

`v gt u, y gt 0`

D

`v = u, y lt 0`

Text Solution

Verified by Experts

The correct Answer is:
`D`
Since magnetic fore is `bot`
`oversetrarrF =- e (oversetrarrV xx oversetrarrB)`
` = - eVB_(0) (hati xx -hatk) =eVB_(0) (-hatj)`
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