WorksheetsEnd of Term Exam (Adv. Physics)
Total questions: 10
Worksheet time: 24mins
Name
Class
Date
1.
When charging a capacitor, the transfer of charges stops when:
a)
the potential difference across the capacitor equals the potential difference across the battery
b)
the potential difference across the capacitor is greater than the potential difference across the battery
c)
the potential difference across the capacitor is smaller than the potential difference across the battery
d)
the capacitance of the capacitor increases
2.
Which of the following properties characterizes a series combination of 3 capacitors?
a)
𝑄𝑒𝑞=𝑄1+𝑄2+𝑄3
b)
𝑄𝑒𝑞=𝑄1=𝑄2=𝑄3
c)
C. Δ𝑉𝑒𝑞=Δ𝑉1=Δ𝑉2=Δ𝑉3
d)
ΔC𝑒𝑞=Δ𝑉1+Δ𝑉2+Δ𝑉3
3.
A parallel-plate capacitor is initially filled with a dielectric and gets fully charged by connecting it to a power supply.After disconnecting the capacitor from the power supply, the dielectric is removed from the capacitor. What happens to electric field and Voltage?
a)
Electric Field increases, Voltage Increases
b)
Electric Field decreases, Voltage Decreases
c)
Electric Field is constant, Voltage is constant
d)
Electric Field increases, Voltage Decreases
4.
The following diagram features 4 capacitors, each of capacitance 3nF, connected to a 50 V battery. The capacitance of the equivalent capacitor is equal to:
a)
2 nF
b)
3 nF
c)
5 nF
d)
7.5 nF
5.
A parallel-plate capacitor has 2 rectangular plates, each of dimensions 10 cm and 2 cm. The space between the plates is filled with Nylon(k = 3.4), which has a dielectric strength of 4x106 V/m and a thickness of 4 cm. The maximum voltage that can be held by the capacitor is_______________.
a)
7.5×1010 V
b)
4.33×108 V
c)
1.6×105 V
d)
1.2×105 V
6.
A system of 2 charges has a potential energy Ui. If each of these charges were tripled, and the distance between them was doubled, what would be the new potential energy Uf of the system?
a)
Uf = 8Ui
b)
Uf = (9/2)Ui
c)
Uf = 3Ui
d)
Uf = 18Ui
7.
An electron, initially moving with a speed of 2×104 m/s, enters an electric field which increases its speed to 3×106 m/s. What potential difference does the electron go through in this process?
a)
102.48 V
b)
25.62 V
c)
409.93
d)
51.24
8.
An air-filled parallel-plate capacitor is characterized by a charge Q0, a stored energy U0 and a capacitance C0, when connected to a battery of voltage ΔV0. Which of the following statements is true about the new characteristics of the capacitor (Q, C, ΔV) when a dielectric of constant k is inserted between the plates, while the capacitor is still connected to the battery?
a)
Q = Q0, C = kC0, ΔV = kΔV0
b)
Q = k.Q0, C = kC0, ΔV = kΔV0
c)
Q = Q0, C =C0/k, ΔV = ΔV0/k
d)
Q = kQ0, C = kC0, ΔV = ΔV0
9.
A parallel-plate capacitor has 2 rectangular plates, each of dimensions 5 cm and 2 cm. The space between the plates is filled with Nylon(k = 3.4), which has a dielectric strength of 4x106 V/m and a thickness of 4 cm. The capacitance of the capacitor is equal to _________________________.
a)
2.84 × 10-11 F
b)
1.66 × 10-11 F
c)
2.01 × 10-12 F
d)
7.52 × 10-13 F
10.
A parallel-plate capacitor has 2 rectangular plates, each of dimensions 10 cm and 2 cm. The space between the plates is filled with Nylon(k = 3.4), which has a dielectric strength of 4x106 V/m and a thickness of 4 cm. The maximum charge that can be held by the capacitor is_______________.
a)
2.4 x 10-7 C
b)
6.0 x 10-6 C
c)
9.5 x 10-9 C
d)
1.2×10-5 C
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