ФО

1. The electron moves in the field, the lines of force which are shown in the figure. Choose the correct answer.

А) When moving the electron from point 1 to point 2, the electric field performed a positive work.

В) When moving the electron along the trajectory 1-2-3-1, the electric field performed a positive work.

С) When moving the electron from point 1 to point 2, the electric field performed a negative work.

D) When moving the electron from point 2 to point 3, the electric field performed a positive work.

2. The potential energy of the charge 3 nKl in the electric field is 12 MJ. Calculate the potential of the field at this point.

А) 9 kV                                  В) 4 kV                                  С) 0,4 kV                   D) 0,25 mV

3. On The earth's surface, the gravitational field strength is 10 N/kg. What is the intensity of the gravitational field at a distance R from its surface (R – radius of the Earth)?

А) 1,25 N/kg              В) 2,5 N/kg                             С) 5 N/kg                    D) 10 N/kg