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Electric Fields Worksheet 2 1. In a uniform electric field, the potential difference between two points 12.0 cm apart is 1.50 x 102 V. Calculate the magnitude of the electric field. [1.25 x 103 N/C] 2. The magnitude of the electric field strength between two parallel plates is 4.0 x 103 N/C. The plates are connected to a battery with an electric potential difference of 12 V. What is the plate separation? [3.0 x 10-3 m] 3. A proton is released from rest in a uniform electric field of 8 x 104 N/C directed along the positive xaxis. The proton undergoes a displacement of 0.5 m in the direction of the electric field. Find the change in the electric potential between the protons initial and final positions. [-4 x 104 V] 4. For the same situation as in question 3, find the change in potential energy of the proton for this displacement. [-6.4 x 10-15 J] 5. For the same situation as in question 3, find the speed of the proton after it has been displaced from rest by 0.5 m. [2.77 x 106 m/s] 6. Calculate the speed of a proton that is accelerated from rest through a potential difference of 120 V. Repeat the calculation for an electron. [1.52 x 105 m/s; 6.5 x 106 m/s] 7. An ion accelerated through a potential difference of 115 V experiences an increase in kinetic energy of 7.37 x 10-17 J. Calculate the charge on the ion. [6.41 x 10-19 C, or 4 excess electrons] 8. How much work is done (by a battery, generator, or other source of electrical energy) in moving Avogadro’s number of electrons from an initial point where the electric potential is 9 V to a point where the potential is -5 V? (The potential is measured relative to a common reference point). [1.35 x 106 J] 9. The electric field between two charged parallel plates separated by a distance of 1.8 cm has a uniform value of 2.4 x 104 N/C. Find the potential difference between the plates. How much kinetic energy would be gained by a deuteron in accelerating from the positive plate to the negative plate? (A deuteron is a particle with one proton and one neutron.) [432 V, 6.92 x 10-17 J] Textbook: P.358 6, 7, 12 P.362 2, 3 P.371 3, 4, 5 P.378 (Review) – try some problems