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Given below are two statements
Statement $I$ : The electric force changes the speed of the charged particle and hence changes its kinetic energy: whereas the magnetic force does not change the kinetic energy of the charged particle
Statement $II$ : The electric force accelerates the positively charged particle perpendicular to the direction of electric field. The magnetic force accelerates the moving charged particle along the direction of magnetic field. In the light of the above statements, choose the most appropriate answer from the options given below
Both Statement $I$ and Statement $II$ are correct
Both Statement $I$ and Statement $II$ are incorrect
Statement $I$ is correct but Statement $II$ is incorrect
Statement $I$ is incorrect but Statement $II$ is correct
Solution
Electric field can change speed and kinetic energy but magnetic field can not change speed $\triangle KE$. Because magnetic force is always $\perp$ to velocity.
