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An electron enters an electric field with its velocity in the direction of the electric lines of force. Then

1. The path of the electron will be a circle
2. The path of the electron will be a parabola
3. The velocity of the electron will decrease
4. The velocity of the electron will increase

Correct answer: The velocity of the electron will decrease

Solution

The electric force on an electron is opposite to the direction of the electric field because its charge is negative. Since the electron enters with velocity along the field lines, the force acts opposite to its motion. Therefore, its speed decreases.

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