Given below are two statements:Statement I: T | vedclass

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(C) Statement $I$ is correct: The electric force $\vec{F}_e = q\vec{E}$ acts on a charged particle,which can change its speed and kinetic energy. The

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Statement $I$ is correct but Statement $II$ is incorrect.

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(C) Statement $I$ is correct: The electric force $\vec{F}_e = q\vec{E}$ acts on a charged particle,which can change its speed and kinetic energy. The magnetic force $\vec{F}_m = q(\vec{v} 	imes \vec{B})$ is always perpendicular to the velocity $\vec{v}$,so the work done by the magnetic force is $W = \int \vec{F}_m \cdot d\vec{r} = \int (\vec{F}_m \cdot \vec{v}) dt = 0$. Thus,it does not change the kinetic energy.Statement $II$ is incorrect: The electric force accelerates a positively charged particle in the direction of the electric field,not perpendicular to it. The magnetic force acts perpendicular to the velocity of the charged particle,not necessarily along the direction of the magnetic field.Therefore,Statement $I$ is correct and Statement $II$ is incorrect.

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