Capacitor and Capacitance

A proton moves 10 cm on a path in the direction of a uniform electric field of strength 3.0 N/C. How much work is done on the proton by the electrical field?

• 4.8 x 10^-20 J

• -4.8 x 10^-20 J

• .6 x 10^-20 J

• zero

Tags

NGSS.HS-PS3-5

A 9.0-V battery is connected between two parallel metal plates 4.0 mm apart. What is the magnitude of the electric field between the plates?

• 2.3 x 10³ N/C

• 9.0 N/C

• 2.3 N/C

• 0.75 x 10^-6 N/C

If an electron is accelerated from rest through a potential difference of 1 200 V, find its approximate velocity at the end of this process. (e = 1.6 x 10^-19 C; m_e = 9.1 x 10^-31 kg).

• 1.0 x 10⁷ m/s

• 1.4 x 10⁷ m/s

• 2.1 x 10⁷ m/s

• 2.5 x 10⁷ m/s

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

In which case does an electric field do positive work on a charged particle?

• A negative charge moves opposite to the direction of the electric field.

• A positive charge is moved to a point of higher potential energy.

• A positive charge completes one circular path around a stationary positive charge.

• A positive charge completes one elliptical path around a stationary positive charge.

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

A 9.0-V battery moves 20 mC of charge through a circuit running from its positive terminal to its negative terminal. How much energy was delivered to the circuit?

• 2.2 mJ

• 0.020 J

• 0.18 J

• 4.5 x 10³ J

Tags

NGSS.HS-PS3-1

Find the electrical potential at 0.15 m from a point charge of 6.0 µC. (ke = 8.99 x 10⁹ Nm²/C²).

• 5.4 x 10⁴ V

• 3.6 x 10⁵ V

• 2.4 x 10⁶ V

• 1.2 x 10⁷ V

Tags

NGSS.HS-PS2-4

Two point charges of values +3.4 µC and +6.6 µC, respectively, are separated by 0.20 m. What is the potential energy of this 2 charge system? (k_e = 8.99 x 10⁹ Nm²/C²)

• +0.34 J

• -0.75 J

• +1.0 J

• -3.4 J

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-1

NGSS.HS-PS3-5

Two protons, each of charge 1.60 x 10^-19 C, are 2.00 x 10^-5 m apart. What is the change in potential energy if they are brought 1.00 x 10^-5 m closer together? (k_e = 8.99 x 10⁹ Nm²/C²).

• 1.15 x 10^-23 J

• 3.20 x 10^-19 J

• 3.20 x 10^-16 J

• 1.60 x 10^-14 J

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-1

NGSS.HS-PS3-5

A parallel-plate capacitor has a capacitance of 20 µF. What potential difference across the plates is required to store 7.2 x 10^-4 C on this capacitor?

• 36 V

• 2.2 x 10^-2 V

• 1.4 x 10^-8 V

• 68 V

Increasing the separation of the two charged parallel plates of a capacitor, which are disconnected from a battery, will produce what effect on the capacitor?

• increase charge

• decrease charge

• increase capacitance

• decrease capacitance