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An electron of mass m and charge q is tr...

An electron of mass `m` and charge `q` is travelling with a speed `v` along a circular path of radius `r` at right angles to a uniform of magnetic field `B`. If speed of the electron is doubled and the magnetic field is halved, then resulting path would have a radius of

A

`r/4`

B

`r/2`

C

`2r`

D

`4r`

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The correct Answer is:
D
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