need help understanding what I did wrong

icorrect QuestioIn ) 0.5/ 2 pts I If a neutral metal object has been charged by friction to a charge of one pC, what has happened to it electrically? 6.25 x 10 protons have been removed from it 6.25 x 108 electrons have been added to it 6.25 x 108 electrons have been removed from it 6.25 % 10 protons have been added to it 6.25 x 10 electrons and protons have been added to it [{eelg (e Question 3 0.5/ 2pts What is the magnitude of the acceleration, in m/s2 of an electron when in an electric field of magnitude 2.8 x 104 N/C? A 72 nC charge is located at x = 3.00 m on the x-axis and an 8.0 nC charge is located at x = 7.0 m. At what point on the x-axis is the electric field zero? 4.0 m 6.0 m 6.3 m -5.0 m O. -9.0 m 0.75 / 2 pts orrect Question 6 The electric field has a magnitude of 3.00 N/C at a distance of 60.0 cm from a point charge. What is the charge? 120 pc 3.00 nc 12.0 MC 1.40 nc Page 2 / 12 +