PHY 232 CH 25.1-27.5 Question and
answers 100% correct 2025/2026
A capacitor stores charge Q at a potential difference DV. What happens if the voltage applied to the
capacitor by a battery is doubled to 2 DV? - correct answer ✔The capacitance remains the same and
the charge doubles.
Many computer keyboard buttons are constructed of capacitors as shown in Figure 25.3. When a key is
pushed down, the soft insulator between the movable plate and the fixed plate is compressed. When
the key is pressed, what happens to the capacitance? - correct answer ✔It increases.
If the radius b of the outer sphere approaches infinity, what does the capacitance become? - correct
answer ✔4pi(e0)a
Ceq = C1 + C2 + C3... - correct answer ✔Parallel Capacitors
(1/Ceq)=1/C1+1/C2+1/C3... - correct answer ✔Series Capacitors
Two capacitors are identical. They can be connected in series or in parallel. If you want the smallest
equivalent capacitance for the com-bination, how should you connect them? - correct answer ✔In
series
When the switch is initially open. - correct answer ✔The capacitor remains uncharged.
When the switch is closed. - correct answer ✔The capacitor begins to charge.
If the switch is open then closed and then reopened. - correct answer ✔The capacitors stores and holds
the charge. So, the capacitor remains charged.
answers 100% correct 2025/2026
A capacitor stores charge Q at a potential difference DV. What happens if the voltage applied to the
capacitor by a battery is doubled to 2 DV? - correct answer ✔The capacitance remains the same and
the charge doubles.
Many computer keyboard buttons are constructed of capacitors as shown in Figure 25.3. When a key is
pushed down, the soft insulator between the movable plate and the fixed plate is compressed. When
the key is pressed, what happens to the capacitance? - correct answer ✔It increases.
If the radius b of the outer sphere approaches infinity, what does the capacitance become? - correct
answer ✔4pi(e0)a
Ceq = C1 + C2 + C3... - correct answer ✔Parallel Capacitors
(1/Ceq)=1/C1+1/C2+1/C3... - correct answer ✔Series Capacitors
Two capacitors are identical. They can be connected in series or in parallel. If you want the smallest
equivalent capacitance for the com-bination, how should you connect them? - correct answer ✔In
series
When the switch is initially open. - correct answer ✔The capacitor remains uncharged.
When the switch is closed. - correct answer ✔The capacitor begins to charge.
If the switch is open then closed and then reopened. - correct answer ✔The capacitors stores and holds
the charge. So, the capacitor remains charged.
