Why is the electric potential energy of two like charges always positive?
The graphs of potential energy between two charges for like and unlike charges are shown below. For like charges, the potential energy is always positive, that is because we need to put energy in the system to bring like charges closer together.
What is a good efficiency ratio?
An efficiency ratio of 50% or under is considered optimal. If the efficiency ratio increases, it means a bank’s expenses are increasing or its revenues are decreasing. This means the company’s operations became more efficient, increasing its assets by $80 million for the quarter.
How do you know if electric potential is positive or negative?
If it travels to a higher potential work has been done on the particle. So is work done is positive when it moves the way it naturally would. If it moves freely it will move to a place of lower potential. Hence change in potential energy is negative.
Why is electric potential energy larger when two like charges are close together than when two unlike charges are close together?
Because the potential energy of like-charged particles increases as they are brought closer together, while that of opposite-charged particles decreases, it is convenient to assign a value of zero potential energy to two charged particles which are a long distance apart.
Is the electric potential energy of two unlike charges positive or negative?
Note that the electrical potential energy is positive if the two charges are of the same type, either positive or negative, and negative if the two charges are of opposite types. This makes sense if you think of the change in the potential energy ΔU as you bring the two charges closer or move them farther apart.
Is potential can be negative?
Yes,potential energy can be negative. Potential energy is a relative concept which depends on the frame of reference which has been chosen as zero potential.
Is electric potential zero if electric field is zero?
If the electric field is zero, then the potential has no gradient i.e.: the potential is equal across space. But potential is always measured relative to a baseline, so it can therefore be considered as zero.
Why electric field inside a conductor is zero?
Electric field is zero inside a charged conductor. For a charged conductor, the charges will lie on the surface of the conductor.So, there will not be any charges inside the conductor. When there is no charge there will not be electric field.
Do electric field lines go from positive to negative?
Electric field lines always extend from a positively charged object to a negatively charged object, from a positively charged object to infinity, or from infinity to a negatively charged object. Electric field lines never cross each other.