A particle with a charge $7\mathrm{.}26\backslash$times $108$ is moving in a region where a uniform magnetic field of $0\mathrm{.}650$ is acting in the$+.$ At a particular instant, the velocity of the particle is characterized by the components: $=1\mathrm{.}68\backslash$times $104,=3\mathrm{.}11\backslash$times $104,=5\mathrm{.}85\backslash$times $104.$ Compute:a$.)$ b$.)$ the Lorentz force on the particle, expressed as a vector, at this time.the magnitude of the force in part $($a$)$