An electron is placed at a position on the x-axis where the electric potential i

Question

An electron is placed at a position on the x-axis where the electric potential is + 10 V. Which idea below best describes the future motion of the electron?
(a) The electron will move left (-x) since it is negatively charged.
(b) The electron will move right (+x) since it is negatively charged.
(c) The electron will move left (-x) since the potential is positive.
(d) The electron will move right (+x) since the potential is positive.
(e) The motion cannot be predicted with the information given.


What happens to a positive charge that is placed at rest in a uniform magnetic fIeld? (A uniform field is one whose strength and direction are the same at all points.)
(a) It moves with a constant velocity since the force has a constant magnitude.
(b) It moves with a constant acceleration since the force has a constant magnitude.
(c) It moves in a circle at a constant speed since the force is always perpendicular to the velocity.
(d) It accelerates in a circle since the force is always perpendicular to the velocity.
(e) It remains at rest since the force and the initial velocity are zero.



PLEASE some explanation.....

Explanation / Answer

1. An electron is placed at a position on the x-axis where the electric potential is + 10 V. Which idea below best describes the future motion of the electron?

Ans elecron being negaitve charge moves from lower potential ot higher potential but we are not given that towrds which direction potential is decreassing so correct option is

(e) The motion cannot be predicted with the information given.

2. What happens to a positive charge that is placed at rest in a uniform magnetic fIeld? (A uniform field is one whose strength and direction are the same at all points.)

Ans as the charge is at rest so velocity of charge is zero and force exerted by magnetic field is

F = qBv sin theta

as v=o so F=0 hence correct option is

(e) It remains at rest since the force and the initial velocity are zero.

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