A proton of mass m moving with a speed v...

A proton of mass m moving with a speed `v(lt lt c`, velocity of light in vacuum) completes a circular orbit in time T in a uniform magnetic field. If the speed of the proton in increased to `sqrt(2)`v, what will be time needed to complete the circular orbit?

`sqrt(2)T`

`T`

`T/(sqrt(2))`

`T/2`

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