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“Both magnetic and electric feilds are perpendicular in a region.If we place an electron at rest in that region.what will be the path followed by that electron ?”
– asked Vimal
When the electron is at rest, it is not affected by magnetic field, but due to electric field, it will begin to move in a direction opposite to the field. This initial direction determines the plane of motion. Then it is acted upon by magnetic field as the motion starts
(The answer is incomplete. I am leaving it for the visitors to think and respond)
“An electron enters a magnetic field at right angles to it. The direction of force acting on the electron will be __________?”
Answer: The direction of force is given by Fleming’s Left Hand Rule.
If we stretch the thumb, forefinger and central finger of left hand in such a way that the forefinger shows the direction of magnetic field, the central finger shows the direction of movement of positive charge (or the direction of current) [here the direction must be opposite to the direction of motion of the electron since electron is negatively charged], then the direction of thumb will give the direction of force acting on the charge.