# Why Is Potential Higher at the Positive End of a Conducting Rod?

• HAL10000
In summary, the potential in a conducting rod is higher at the positive end due to the conventional way of measuring potential and the force exerted by the magnetic field on the electrons. While negative charges do flow from lower to higher potential, the end with the highest positive charge is considered to have the highest potential.
HAL10000
When an induced emf is created in a conducting rod why is the resulting potential higher at the positive end of the rod?

Since the electrons accumulate at the negative end of the rod then wouldn't this be the higher potential instead?

Don't negative charges flow from lower to higher potential?

Last edited:
The potential is usually talked about in conventional way. What you say is correct. But conventionally, positive charge is spied upon. The region having low negative charge is nothing but a region with high positive charge(w.r.t. conductor in this case). The end having high positive charge is considered to be havin the highest potential. If you follow the electrons, vice versa.

HAL10000 said:
Don't negative charges flow from lower to higher potential?

The magnetic field which is inducing the emf exerts another force and moves the electrons against the will of the electric field. After all

$F=q(E+v\times B)$

Thanks, I understand now

This is a common misconception about potential and the flow of charges. In a conducting rod, the potential is actually higher at the positive end because it is the end that is connected to the source of the induced emf, such as a battery or a changing magnetic field. The positive end is considered the "higher potential" because it is at a higher electrical potential energy compared to the negative end.

Electrons may accumulate at the negative end due to the induced emf, but this does not mean that the potential at that end is higher. In fact, the negative charges are being repelled by the higher potential at the positive end and are being forced to accumulate at the negative end. This is similar to how water flows from higher to lower potential in a waterfall, even though the water may accumulate at the bottom due to the force of gravity.

In summary, the potential is higher at the positive end of a conducting rod because it is connected to the source of the induced emf, and the negative charges are being repelled towards the lower potential at the negative end. This is consistent with the general principle that charges flow from higher to lower potential.

## 1. What is potential in a conducting rod?

Potential in a conducting rod refers to the amount of electric potential energy per unit charge that is present in the rod. It is a measure of the work that would be required to move a unit of electric charge from one point to another within the rod.

## 2. How is potential in a conducting rod related to electric fields?

Potential in a conducting rod is closely related to electric fields, as the potential difference between two points within the rod is equal to the electric field strength multiplied by the distance between the two points. This relationship is known as the gradient of the potential.

## 3. Can the potential in a conducting rod be changed?

Yes, the potential in a conducting rod can be changed by altering the amount of charge within the rod or by changing the distance between the two points where the potential is measured. Additionally, the potential can be changed by applying an external electric field to the rod.

## 4. What is the difference between potential in a conducting rod and potential difference?

Potential in a conducting rod refers to the potential at a specific point within the rod, while potential difference refers to the difference in potential between two points. In other words, potential difference is a measure of the change in potential between two points, while potential in a conducting rod is a measure of the potential at a single point.

## 5. How is potential in a conducting rod measured?

Potential in a conducting rod can be measured using a voltmeter, which is a device that measures the potential difference between two points. The voltmeter is connected to the two points within the rod, and the potential difference is displayed on the device.

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