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Q. 7

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
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Short Answer

A capacitor with plates separated by distance is charged to a potential difference . All wires and batteries are disconnected, then the two plates are pulled apart (with insulated handles) to a new separation of distance .a. Does the capacitor charge change as the separation increases? If so, by what factor? If not, why not?b. Does the electric field strength change as the separation increases? If so, by what factor? If not, why not?c. Does the potential difference change as the separation increases? If so, by what factor? If not, why not?

Part

The capacitor charge remains constant.

Part

The electric field strength remains constant.

Part

Potential difference doubles.

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Step by Step Solution

Step: 1 Capacitor chanrge seperation: (part a)

Charge will begin to flow from higher potential to lower potential if the plates of a charged capacitor are connected by metallic wire, and the energy held in the capacitor will be turned into heat energy. As a result, the capacitor gets discharged. Charge conservation applies,because no charge flows off the capacitor plates.

Step: 2 Electric field strength seperation: (part b)

Where the lines are tightly spaced, the field is stronger. Charge is negative, while charge is positive, because the electric field lines converge towards the charge and away from charge .

Where are constants.

Step: 3 Potential difference seperation: (part c)

The potential difference equals the quantity of flow amplified by the resistance (also known as voltage). A potential difference of one Volt equals one Joule of energy when one Coulomb of charge travels between two locations in a circuit.

The potential difference doubles when becomes .

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