Problem

Problem

A charged particle enters into a gravity free space occupied by an electric field E\boldsymbol{E} and magnetic field B\boldsymbol{B} and it comes out without any change in velocity. Then, the possible cases may be a. E=0\boldsymbol{E} = 0 and B≠0\boldsymbol{B} \neq 0 b. E≠0\boldsymbol{E} \neq 0 and B=0\boldsymbol{B} = 0 c. E≠0\boldsymbol{E} \neq 0 and B≠0\boldsymbol{B} \neq 0 d. E=0\boldsymbol{E} = 0 , B=0\boldsymbol{B} = 0

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