Download Physics Worksheet 3 Potential Difference 1. The potential difference

Physics Worksheet 3 Potential Difference
1. The potential difference between the two sides of an ordinary electrical outlet is 120 V. How much
energy does an electron gain when it moves from one side to the other?
2. Find the magnitude of the potential difference between two points located 1.4 m apart in a uniform 650
N/C electric field, if a line between the points is parallel to the field.
3. A 3.5-cm-diameter isolated metal sphere carries a net charge of 0.86 C. (a) What is the potential at the
sphere’s surface? (b) If a proton were released from rest at the sphere’s surface, what would be its speed far
from the sphere?
4. Electrons in a TV tube are accelerated from rest through a 25-kV potential difference. With what speed
do they hit the TV screen?
5. AsphereofradiusRcarriesanegativechargeofmagnitudeQ,distributedinasphericallysymmetricway.Findthe
“escape speed” for a proton at the sphere’s surface—that is, the speed that would enable the proton to
escape to arbitrarily large distances.