Question

1. An electron, a neutron(which has zero charge) and a proton are in an electric field generated by charged plates which points in the +x direction. The three particles are sufficiently far apart that their forces on each other are negligible. Assume also that forces other than the electrostatic ones on the three particles are negligible.

We know that: (Choose the correct answers)

1. the acceleration of the electron is in the +x direction.

2. the x coordinate of the electron is less than the x coordinate of the neutron .

3. the velocity of the electron is in the -x direction.

4. the acceleration of the electron is in the -x direction.

5. the acceleration of the neutron is in the +x direction.

6. the velocity of the neutron is in the +x direction.

7. the neutron is slowing down.

8. the proton is slowing down.

9. the proton is speeding up.

10. the velocity of the proton is in the +x direction.

2. An electron is at rest at the origin at time t exactly zero in a uniform electric field E, find the acceleration of the electron as a function of time t in terms of E and the electron mass m_e.

3. Given that m_e is 9.11X10^-31 kg, if E in problem (2) is 1.2X10⁴ N/C j , find the position of the electron at time t=5X10^-7 s .

4. Suppose that at time t exactly zero instead of being at rest the electron in problem (2) is moving with a velocity of 1.0X10⁶ m/s . Find its position at time t=5X10^-7 s.

Answer 1