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A magnetic field of (4 xx 10^-3 hatk) T ...

A magnetic field of `(4 xx 10^-3 hatk)` T exerts a force of `(4hati+3hatj) xx 10^-10 N` on a particle having charge of `1 xx 10^-9 C` and moving in `x-y` plane. Find the velocity of the particle.

A

`(75 hati+100 hatj)ms^-1`

B

`(75 hati-100 hatj)ms^-1`

C

`(-75 hati+100 hatj)ms^-1`

D

`(-75 hati-100 hatj)ms^-1`.

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