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Velocity and acceleration vectors of a charged particle moving in a magnetic field at some instant are `vec(v)=3hat(i)+4hat(j)` and `vec(a)=2hat(i)+xhat(j)`. Selcet the wrong alternative.

A

`x=-1.5`

B

`x=3`

C

magnetic field is along `z-` direction

D

Kinetic energy of the particle is constant

Text Solution

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The correct Answer is:
2
`vec(F).vec(v)=0`
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