A dielectric material is placed between the plates of a capacitor while the battery is still connected. What happens to the capacitance (C), voltage (V) and charge (Q)?

Question

BlackTom AI · Accepted Answer

To tackle this question, I’ll walk through what happens to each quantity when a dielectric is placed between the plates while a battery remains connected.
Option a: C increases, V decreases, Q remains the same. This is inconsistent with a battery-connected scenario: the voltage across the capacitor remains fixed by the battery, so V cannot decrease. Also, while C would increase due to the dielectric, Q would not stay the same because Q = C × V and V is constant, so Q must increase.
Option b: C decreases, V increases, Q remains the same. This contradicts the physics here: inserting a dielectric increases the capacitor’s ability to store charge, so C increases, not decreases. Since the battery fixes V, V does not increase either. Thus this optionmisstates both C and V, and keeping Q the same is incompatible with C changing while V is fixed.
Option c: C increases, V remains the same, Q increases. This aligns with the correct reasoning: a dielectric raises the capacitance (C ↑) when connected to a fixed voltage source, the voltage V stays equal to the battery (V stays the same), and the charge Q increases because Q = C × V and C has increased while V is unchanged.
Option d: C decreases, V remains the same, Q decreases. This is opposite to what a dielectric does to capacitance (C does not decrease when a dielectric is placed between the plates with the battery connected). Since C would increase, not decrease, and Q = C × V with V fixed would also increase, this option is incorrect.
In summary, the only option that consistently describes the physical behavior under these conditions is the one where C increases, V stays the same, and Q increases.

UCIC 202503 PHYS101 Quiz 10

A dielectric material is placed between the plates of a capacitor while the battery is still connected. What happens to the capacitance (C), voltage (V) and charge (Q)?

查看解析

登录即可查看完整答案

类似问题

A capacitor is fully charged before the battery is disconnected. Then a dielectric material is placed between the plates of a capacitor. What happens to the capacitance (C), voltage (V) and charge (Q)?

What does a capacitor consist of?

Select all that are true.

A system of four capacitors is connected across a 90-V voltage source as shown in the figure. What is the equivalent capacitance of this system?

Capacitance resists direct current at constant state

Capacitance resists direct current at constant state

You have three capacitors, capacitor 1 has a capacitance 6.78 mF, capacitor 2 has capacitance 2.51 mF and capacitor 3 has a capacitance of 3.84 mF. Calculate the capacitance of the circuit in the following configurations: Configuration 1 (all in series): C = Answer Question 3[input] mF

更多留学生实用工具

考试浏览器助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单