2. Suppose each pair of electrodes were attached to the same power supply and th

Question

2. Suppose each pair of electrodes were attached to the same power supply and then detached, leaving the electrodes elctrically isolated. The following changes are made to the electrodes while they remain detached from the battery. Using the electrodes as a guide, state whether each change would cause the following quantities to increase, decrease, or remain the same. In each case, brielfy (a) The electrodes are moved farther apart Potential Difference -18-d Electric field E Charge Q fydA Capacitance C- (b) A circular electrode is replaced with a flat electrode. Potential Difference Electric field Charge (c) A dielectic (ie, an insulator) is placed between the electrodes. Potential Difference Electric field Charge Capacitance (d) A circular electrode is replaced with a larger cirele centered on the same point. Potential Difference Electric fleld Charge Capacitance

Explanation / Answer

Ans2 : C) Potential Difference: we will know the result by places dielectric between the elctrodes. Now when any potential difference is applied across two points, charge will flow from the higher potential point to lower potential point irrespective of whether the charge is flowing through a conductor or an insulator. The difference between the two is that while for conductors the amount of charge flowing per second is large, its very small for the insulators. Electric field : No, we placed electric field between the electrodes Dielectric, insulating material or a very poor conductor of electric current. When dielectrics are placed in an electric field, practically no current flows in them because, unlike metals, they have no loosely bound, or free, electrons that may drift through the material. Instead, electric polarization occurs. Charge : Now, We see what the result come when we placed the electrodes The induced charge on an insulator will create a uniform electric field, like in a parallel-plate capacitor, but one that is directed opposite to the applied electric field. A dielectric is an insulator placed between the plates of a capacitor. Capacitance: Now, we placed the dielectric between the electrodes

Dielectrics are usually placed between the two plates of parallel plate capacitors. They can fully occupy the region between the plates or can partially occupy.

When the dielectric is placed between the two plates of parallel plate capacitor, it is polarized by the electric field present.

When the dielectric is fully placed between the two plates of capacitor then it’s dielectric constant increases from it’s vacuum value.

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