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magnetar
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why positive or negtive polar of battery can not attract small objects ?
supratim1 said:you tell me why do you think it should?
rcgldr said:It's because a normal battery doesn't have enough voltage to attract small objects like a statically charged rod with high voltage.
rcgldr said:I didn't realize you meant static related attraction. It's because a normal battery doesn't have enough voltage to attract small objects like a statically charged rod with high voltage.
Assuming a moderate amount of capacitance, then a high voltage battery (if such a thing exists) would have signicant charge on at least at one of it's terminals. As mentioned above, batteries do attract dust.tiny-tim said:Voltage is relative.
and this causes magnetic field?supratim1 said:Most batteries are electrochemical cells, with voltage controlled by varying the concentration of the ions. the EMF can be calculated using the Nernst equation.
when a conductor connects the two terminals, the electrons get a path to go to a higher potential (which they die to do). the battery creates an electrostatic field outside it, which makes the electrons move.
No one did. What was stated the terminals of a battery have a static charge, relative to the voltage (divided by the equivalent of capacitance) of the battery, and that the static charge is enough to attract dust.torquil said:A battery not in a closed circuit (i.e. without a current running through it) does not create a magnetic field. I don't think anyone claimed that it did?
rcgldr said:No one did. What was stated the terminals of a battery have a static charge, relative to the voltage (divided by the equivalent of capacitance) of the battery, and that the static charge is enough to attract dust.
magnetar said:Because the positive pole accumulate positive charges, it should attract small objects as the charged rubber rod do ?
magnetar said:why positive or negtive polar of battery can not attract small objects ?
The positive and negative poles of a battery repel each other because they have opposite charges. The positive pole has an excess of positively charged particles, while the negative pole has an excess of negatively charged particles. According to the laws of electrostatics, opposite charges attract while like charges repel. Therefore, the positive and negative poles of a battery will naturally repel each other.
Small objects do not get attracted to the positive or negative pole of a battery because the attractive force between the battery and the small object is very weak compared to the repulsive force between the positive and negative poles of the battery. The attractive force is also affected by the distance between the battery and the object, making it even weaker for small objects that are farther away.
No, switching the poles of a battery will not change the fact that like charges repel and opposite charges attract. The positive pole will still have an excess of positively charged particles and the negative pole will still have an excess of negatively charged particles. Therefore, the poles will still repel each other and small objects will not be attracted to either pole.
Electrons play a crucial role in the attraction or repulsion of small objects to a battery. The movement of electrons from the negative to positive pole creates an electric field around the battery. This electric field is what causes the repulsion between the positive and negative poles of the battery and also affects the attraction or repulsion of small objects near the battery.
Larger objects may appear to be attracted to the positive or negative pole of a battery because they are heavy enough to overcome the weak repulsive force between the two poles. However, the main reason for this attraction is usually due to the electric field created by the battery. The electric field can induce a temporary charge on the larger object, causing it to be attracted to the opposite pole of the battery.