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Electron of mass m and charge q is trave...

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

A

`2r`

B

`4r`

C

`r//4`

D

`r//2`.

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