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Electric Field Due to a Dipole Along the Equatorial Line

Cathode rays ...

Question

Cathode rays enter an electric field normal to the field. Then their path in the electric field is :

A

A parabola

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B

A circle

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C

A straight line

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D

An ellipse

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Solution

The correct option is D A parabola
Electric field applies a constant force $e E$ on the electrons (i.e. cathode rays) perpendicular to the beam of electrons due to which the electrons will trace a parabolic path.

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