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A proton enters a magnetic field with a ...

A proton enters a magnetic field with a velocity of `2.5 xx 10^7 ms^-1` making angles `30^@` with the magnetic field. What is the force on the proton ? Given that `B = 2.5 T`.

A

`1.25 xx 10^-12 N`

B

`2.5 xx 10^-12 N`

C

`5.0 xx 10^-12 N`

D

`7.5 xx 10^-12 N`.

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