Download Electric Fields Worksheet 2

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