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# A charge particle moves in a circular path in possible electric and magnetic fields. Which of the following scenarios is possible?

$\begin {array} {1 1} (a)\;E=0, B=0 & \quad (b)\;E=0, B \neq 0 \\ (c)\;E \neq 0, B=0 & \quad (d)\;E \neq 0, B \neq 0 \end {array}$

A charged particle undergoes uniform circular motion in a constant magnetic field
Ans : (b)