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## Homework Statement

A particle of charge -q and mass m enterd magnetic field B at A with speed v1 at an angle alpha and leaves the field at C with v2 at angle beta.Then,

a)alpha=beta

b)v1=v2

c)particle remains in the field for time t=(2m(pi-alpha))/qB

d)All of these

Please see image below

https://ibb.co/iLMrie

## Homework Equations

F=qvB

## The Attempt at a Solution

Really dont know how to do it.Tried resolving components.

#### Attachments

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