Electric Potential and Energy Concepts

This video tutorial covers examples of electric potential and electric potential energy. It begins with calculating the electric potential near a hydrogen atom and the work done in placing an electron at a specific point. The tutorial then explores the change in electric potential energy for a charge moving between two points with different potentials. It also includes determining the charge of a sphere with a known potential and calculating the kinetic energy and speed of a proton released from rest near the sphere. The video encourages viewers to practice calculations independently.

What is the formula for electric potential at a distance from a charge?

• V = kr/q

• V = q/r

• V = qk/r

• V = kq/r

What is the electric potential at a distance of 2.12 x 10^-10 meters from a proton?

• 6.79 volts

• 7.79 volts

• 5.79 volts

• 8.79 volts

How is work related to electric potential energy?

• Work is the difference of electric potential energy

• Work is the change in electric potential energy

• Work is the sum of electric potential energy

• Work is the product of electric potential energy

What is the work done in placing an electron at a point with a potential of 6.79 volts?

• 3.087 x 10^-18 joules

• 4.087 x 10^-18 joules

• 2.087 x 10^-18 joules

• 1.087 x 10^-18 joules

What is the change in electric potential when a charge moves from 300 volts to -200 volts?

• 700 volts

• 600 volts

• 400 volts

• 500 volts

How much does the electric potential energy change for a 15 nano coulomb charge moving between these points?

• 5.5 x 10^-6 joules

• 7.5 x 10^-6 joules

• 8.5 x 10^-6 joules

• 6.5 x 10^-6 joules

What is the formula for electric potential at the surface of a charged sphere?

• V = kq/r

• V = kr/q

• V = q/k

• V = r/kq

What is the charge of a sphere with a potential of 1000 volts at its surface?

• 4.11 x 10^-9 coulombs

• 3.11 x 10^-9 coulombs

• 2.11 x 10^-9 coulombs

• 1.11 x 10^-9 coulombs

What is the kinetic energy of a proton released from a sphere with a potential of 1000 volts?

• Equal to the change in potential energy

• Unrelated to the change in potential energy

• Twice the change in potential energy

• Half the change in potential energy

What is the speed of a proton when it is 10 cm away from a charged sphere?

• Calculate using kinetic energy and charge

• Calculate using potential energy and charge

• Calculate using kinetic energy and mass

• Calculate using potential energy and distance