An electron is moving along positive $x$-axis. To get it moving on an anticlockwise circular path in $x-y$ plane, a magnetic filed is applied
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(b) To move the electron in $xy$ plane, force on it must be acting in the $y$-direction initially. The direction of $\vec F$ is known, and the direction of $v$ is known, hence by applying Fleming's left hand rule, the direction of magnetic field is also determined.
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