4. (2 pts) If an electron is moving at a constant velocityin a region with no ma

Question

4. (2 pts) If an electron is moving at a constant velocityin a region with no magnetic field, which of

the following must be true?

(a) There are no other charges present.

(b) The electric potential is zero.

(c) The electron is following anequipotential.

(d) The electric field is constant.

(e) The electric field is perpendicular to thevelocity.

5. (2 pts) A stationary electron is released in a uniformmagnetic field. What happens to the electron?

(a) It accelerates in the same direction as the magneticfield points.

(b) It accelerates in the opposite direction as themagnetic field points.

(c) It moves in circular path.

(d) It does not move.

(e) Moreinformation is needed to determine the answer.

Explanation / Answer

1. If an electron is moving at a constant velocity in aregion with no magnetic field ,                that is B = 0          F = B q v = 0     We know that F = Eq           Electric field is E = 0      We have   E = dV / dx    along x - axis                      0   = dV / dx            V = constant Hence answer is : The electron is following anequipotential. 2.A stationary electron is released in a uniform magneticfield ,             It moves in circular path. Hope this helps u!                    

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