Potential Difference Quiz

Voltage is measured in __.

• volts.

• watts.

• coulombs.

• amperes

What is the energy given off by a 50V bulb which has 20C passing through it?

• 2.5J

• 1000J

• 0.4J

• 70J

When lighting happen, 25 C charge is transferred from cloud to the ground and 1.25x10¹⁰ J energy is produced. Calculate the potential difference within cloud and the ground in unit Volt

• 4.00 x 10⁸

• 2.00 x 10⁸

• 3.00 x 10⁸

• 5.00 x 10⁸

A proton ( q = 1.60 x 10^-19 C) moves 10.0 cm on a path parallel to the direction of a uniform electrical field of strength 3.0 N/C. What is the electrical potential energy? (Clue: U (E.P.E.) = Fd = (Eq) x d))

• 4.8 x 10^-20 J

• 1.6 x 10^-20 J

• -4.8 x 10^-20 J

• -1.6 x 10^-20 J

What will be the electrical potential at a distance of 0.15 m from a point charge of 6.0 µC? (k_c = 8.99 x 10⁹ N · m²/C²) Hint: V = kQ/d

• 5.4 x 10⁴ V

• 3.6 x 10⁵ V

• 2.4 x 10⁶ V

• 1.2 x 10⁷ V

At what distance from a point charge of 8.0 µC would the electrical potential be 4.2 x 10⁴ V? (k_c = 8.99 x 10⁹ N·m²/C²)

• 0.58 m

• 0.76 m

• 1.7 m

• 2.9 m

True or False: Electric potential energy and electric potential difference are the same.

• False

• True

Based on Millikan's oil drop experiment, which value of C is not a possible charge of an electron?

• 1.28 x 10^-18 C

• 2.4 x 10^-19 C

• 5.6 x 10^-18 C

• 2.672 x 10^-17 C

Two point charges of values 3.4 µC and 6.6 µC are separated by 0.20 m. What is the electrical potential energy of this two-charge system? [Clue: U = Fe x d where Fe is the electrostatic force of repulsion.]

• 0.34 J

• -0.75 J

• 1.0 J

• -3.4 J

Two protons, each with a charge of 1.6 x 10^-19 C, are 2.0 x 10^-5 m apart. What is the change in electrical potential energy between the charges?

• 1.1 x 10^-23 J

• 3.2 x 10^-19 J

• 3.2 x 10^-16 J

• 1.6 x 10^-14 J