# Electrostatic forces

seb7
Hi, two questions:

Does the same energy put into an attraction force give the same force as a repulsion force? I am wondering if one is measuring slightly weaker than the other.
ie. If I measure the positive/negative attraction force, is the positive/positive repulsion force as strong when given the same energy input?

Also, has anyone tested these forces within a positive or negative environment? as I wonder if a repulsion force actually exists, that maybe its actually an attraction force to the outer more naturally charged environment.

thanks, Seb

Staff Emeritus
Hi, two questions:

Does the same energy put into an attraction force give the same force as a repulsion force? I am wondering if one is measuring slightly weaker than the other.
ie. If I measure the positive/negative attraction force, is the positive/positive repulsion force as strong when given the same energy input?

Also, has anyone tested these forces within a positive or negative environment? as I wonder if a repulsion force actually exists, that maybe its actually an attraction force to the outer more naturally charged environment.

thanks, Seb

Why don't you try and calculate it, because it isn't that difficult. Put a positive charge, say at the origin, and then bring (i) another positive charge from infinity to a location r away from the first charge and (ii) bring a negative charge (same magnitude as in (i)) to the same location r away from the first charge. What is the work done in each case? Other than the difference in "sign" (i.e. work done by the field versus work done onto the field), do you expect there to be a difference in magnitude of the work done?

Zz.

seb7
obviously the simple formula says its the same, but does experiments agree?

Staff Emeritus