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Transcript
Questions on Electric Fields and Coulombs law You have two do to G questions and/or two VG questions on this sheet until Wednesday week 16 1. What is the magnitude and direction of the electric force on an electron in a uniform electric filed of strength 3500N/C that points due east? G 2. A proton is released in a uniform electric field and it experiences an electric force of 3.2 · 10−14 N toward the south. What are the magnitude and direction of the electric field? G 3. An electron is released from rest in a uniform electric field and accelerates to the north at a rate of 125m/s2 . What is the magnitude and direction of the electric field? VG 4. Two parallel plates are charged so that the upper plate has a positive charge and the lower plate has a negative charge. (a) What is the direction of the electric field between the plates? G A drop of oil is made to hover between the two plates.The mass of the drop is 0.33 · 10−12 g. (b) Is the charge of the drop of oil positive or negative? G (c) What is the magnitude of the charge of the drop of oil assuming that the field strength between the plates is 2.0kN/C VG 5. How does the force between two charged balls change assuming that G (a) The charges of both balls doubles. (b) The distance between the balls doubles? 6. Two charged Ping-Pong balls separated by a distance of 1.5m exert a force of 0.0200N on each other. What will be the force if the objects are brought closer, to a separation of only 30.0cm? Mass of electron Mass of proton Charge of electron Charge of proton 1 9.1 · 10−31 kg 1.67 · 10−27 kg −1.6 · 10−19 C +1.6 · 10−19 C VG