You have a capacitor, a battery, and s piece of dielectric material that will fi

Question

You have a capacitor, a battery, and s piece of dielectric material that will fit inside the capacitor. is NOT a parallel plate capacitor. The capacitor is charged by connecting it to the battery, without the dielectric, and then disconnected the battery. All questions that follow are relative to this initial state of the disconnected, charged You may connect or disconnect the battery, change the separation between the plates of the or add or remove the dielectric. You MUST be specific about whether the battery is connected or disconnected. You may NOT make the same change to answer more than one question. Each change must You must use the dielectric at least once. (a) Name one way to increase the electric field in the capacitor. Explain briefly. (b) Name one way to decrease the potential difference between the plates. Explain briefly. (c) Name one way to increase the charge stored on the plates. Explain briefly. (d) Name two changes which, when made simultaneously, could increase the without affecting the electric field between the plates. Explain briefly.

Explanation / Answer

Solution:

a) One way to increase the electric field is to Decrease the separation between the plates.

b) Potential energy can be decreased by Increasing the capacitance of the plates.

c) Charge stored can be increased by Increasing the amount of dielectric used. Dielectric has the property to increase the capacitance between the capacitor plates.

d) The two changes that can be done simultaneously are (i) increase the amount of dielectric. This in turn increases the capacitance .(ii) Increase the area of the plates . That will not affect the electric field.but increases the capacitance.

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