An electron field in a space moves in helical path. We can conclude that

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Magnetic field must be present and electric field may be present

Neither electric field nor magnetic field is present

Only magnetic field should be present

Both the fields must be present

answer is C.

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Detailed Solution

WHEN A CHARGED PARTICLE enters a magnetic field at an angle with the magnetic field or when both electric and magnetic fields are present the charged particle can move in elliptical orbit.

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