Take this Quiz: A-Level Physics: Electric Fields and Capacitance | Zestly

Question 1

Two point charges, $q_1 = +4.0 	imes 10^{-6} 	ext{ C}$ and $q_2 = -2.0 	imes 10^{-6} 	ext{ C}$, are placed $0.30 	ext{ m}$ apart in a vacuum. What is the magnitude of the electrostatic force between them? (Use $k = 8.99 	imes 10^9 	ext{ N m}^2 	ext{ C}^{-2}$)

Accepted Answer

0.80 N

Question 2

A parallel plate capacitor has plates of area $0.050 	ext{ m}^2$ separated by a distance of $2.0 	ext{ mm}$ in a vacuum. If the potential difference across the plates is $100 	ext{ V}$, which of the following statements are correct? (Permittivity of free space $\epsilon_0 = 8.85 	imes 10^{-12} 	ext{ F m}^{-1}$)

Accepted Answer

The capacitance is approximately $2.21 	imes 10^{-10} 	ext{ F}$

Question 3

An electron enters a uniform electric field of $500 	ext{ V m}^{-1}$ directed vertically downwards. If the electron has a horizontal velocity of $2.0 	imes 10^6 	ext{ m s}^{-1}$, what is the magnitude of the vertical acceleration experienced by the electron? (Mass of electron $m_e = 9.11 	imes 10^{-31} 	ext{ kg}$, elementary charge $e = 1.60 	imes 10^{-19} 	ext{ C}$)

Accepted Answer

$8.8 	imes 10^{13} 	ext{ m s}^{-2}$

Question 4

What is the electric potential at a distance of $0.50 	ext{ m}$ from a point charge of $+3.0 	imes 10^{-9} 	ext{ C}$? (Assume potential is zero at infinity, $k = 8.99 	imes 10^9 	ext{ N m}^2 	ext{ C}^{-2}$)

Answer

27 V

Answer

54 V

Answer

108 V

Answer

162 V

Question 5

A capacitor of $100 	ext{ }\mu	ext{F}$ is connected to a $9.0 	ext{ V}$ battery. If the capacitor is then disconnected and connected in parallel to an uncharged $200 	ext{ }\mu	ext{F}$ capacitor, what is the final potential difference across the combination?

Answer

1.5 V

Answer

2.0 V

Answer

3.0 V

Answer

4.5 V