From what I have read so far, I arrive to a conclusion that a stationary charge must experience a force when it is near a current carrying wire. A stationary electron should get attracted and a stationary proton should get repelled. I see there are some who agree to this, but there are many who say that a stationary charge won't experience ANY force near a current carrying wire.
I went into youtube to find if anyone has done it experimentally but no luck. There are tons of videos for two parallel current carrying wires. But none for stationary charge(s) near a current carrying wire.
I assumed this must be fairly simple to do.
- Take a couple of AA batteries
- Connect them end to end using a striped wire
- Charge up a Balloon by rubbing it against a woollen cloth.
- Bring the battery/wire setup near the balloon and it should get attracted if there is a field.
But since no one seem to have tried this, I wanted to ask if there is any flaw in the above experiment? Would it not work to prove or disprove the theory?
Update: Okay, it turns out this is not so simple
and cannot be carried at home. But here is what I found:
We present several kinds of experiments. Some map the lines of electric field outside resistive wires carrying steady currents. Others map the equipotential lines outside these conductors. Other experiments directly measure the force between a charge test body and a wire carrying a steady current, when there is no motion between the wire and the test body. Anther experiment measures the charging of an electroscope connected to different points of a circuit carrying a steady current. Yet another experiment describes how to obtain a part of the surface charge in different points of the circuit, showing also how to verify if it is positive or negative and also its magnitude. Bergmann and Schaefer present some experiments in which they mapped the electric field lines [172, pp. 164-167] [173, pp. 197-199]. They comment that due to the great conductivity of metals it is difficult to utilize metals as conductors in these experiments. Metals cannot sustain a great potential difference between their extremities, so that they produce only a very small external electric field. For this reason they utilize graphite paper strips of high resistivity and apply 20 000 to 40 000 volts between their extremities in order to produce a steady current along the strip. They ground the center of the strip to put it at zero potential, so that the lines of the electric field are symmetrically distributed around it. They then spread semolina in castor oil around the strip, and obtained the result shown in Figure 3.1. The central straight dark line is the paper strip carrying a steady current. The particles of semolina polarize due to the external electric field and align themselves with it, analogous to iron filings mapping a magnetic field. It should be observed that along the external surface of the conductor there is a longitudinal component of the electric field. This aspect differentiates it from the electric field outside conductors held at a constant potential (in which case the external electric field in steady state is normal to the conductor at every point of its surface), as has been pointed out by Bergmann and Schaefer.