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A magnetic field 4xx10^(-3) kT exerts a...

A magnetic field `4xx10^(-3)` kT exerts a force `(4 hat I + 3 hat j) xx10^(10)` N on a particle having a charge `10^(-9)` C and going on the XY plane The velocity of the particle is

A

`-75 hat I + 100 hat j`

B

`-100 hat I + 75 hat j`

C

`25hat I + 2 hat j`

D

`2 hat I + 25 hat i`

Text Solution

Verified by Experts

The correct Answer is:
A
From lorentz force
`F=q(vxx B)`
and `B=4xx10^(-3) hatk T`
solving we get
a=-75 , b =100 `rarr` v=-75 `hat I +100 hatj`
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