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An alpha particle moving with the veloci...

An alpha particle moving with the velocity `vec v = u hat i + hat j` ,in a uniform magnetic field `vec B = B hat k` . Magnetic force on alpha particle is

A

`(euB/sqrt(3))(hat i + hat j)`

B

`2euB(hat i + hat j)`

C

`2euB(hat i - hat j)`

D

`euB(hat i + hat j)`

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