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An alpha particle moving with a velocity...

An alpha particle moving with a velocity `vec(v)_(1)=2hat(i)m//s` is a uniform magnetic field experiences a force `vec(F)_(1)=-4e(hat(j)-hat(k))N`. When the particle moves with a velocity `vec(v)_(2)=hat(j)m//s`, then the force experienced by it is `vec(F)_(2)=2e(hat(i)-hat(k))N`. The magnetic induction `vec(B)` at that point is `:`

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