A charge of 40 µC is pushed by a force of 15 µN a distance of 1.3 mm in an electric field.

What is the electric potential difference?

2.0 × 10-8 V
4.6 × 10-7 V
4.9 × 10-4 V
3.8 × 10-1 V

Which statement correctly describes a step-up transformer? a. it increases the amount of electric energy available. b. it increases the voltage of an electric current. c. it changes direct current into alternating current. d. it has more loops of wire in its primary coil.

Idon’t quite understand this problem

(a) calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 10.0 g. silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b) imagine adding electrons to the pin until the negative charge has the very large value 1.00 mc. how many electrons are added for every 109 electrons already present