A beta particle is essentially an electron. Electrons have a negative charge and as such, they are attracted to positively charged objects and fields.
It produced a magnetic field. If it's charged, it can be negative OR positive. It's magnetic because if they're both alike signs (both positive or both negative) they repel like magnets. If one particle is positive and one is negative, they attract like magnets.
All subatomic particles with electric charge, such as electrons, protons, and neutrons, have an electric field around them. This electric field is a result of the particle's charge and extends outward from the particle in all directions.
The alpha particle is actually a helium-4 (4He++) nucleus, and it's composed of two protons and two neutrons. This gives it an overall positive charge. When directed between the electrodes as asked, its positive charge will cause it to be attracted by the negative electrode and repelled by the positive electrode. It's simple electrostatics with opposite charges attracting and like charges repelling. The gamma ray is high energy electromagnetic radiation. It will pass between the electrodes and be unaffected.
In a way, you have answered your own question! All objects that have an electric charge at all have a charge which is either positive or negative. In either case, the charge can be large or small. The charge of the object has a particular value corresponding to a positive number for positive charges and a negative number for negative charges. Objects with no charge, or neutral objects, can be thought of as having an electric charge of zero. So it is easiest to think of the charge of an object as a number of charge units, where that number can be positive, negative or zero. So let's ask a slightly different version of your question: I've heard of positive and negative charges separating in an electric field. What is an example of this happening? Here is an example: A neutral atom of gas, like argon, is sitting in an electric field, and one of its electrons gets knocked off by a charged particle which comes flying by very close to it. The flying charged particle continues on, leaving the knocked off electron behind in the electric field. Now, the argon atom has been separated into two pieces: an argon ion with positive charge, +1 unit, and the knocked-off electron with negative charge, -1 unit. These two oppositely charged objects will separate further in the electric field if that field is strong enough. In fact, several of the particle detectors at Jefferson Lab work via this exact physical process.
Ions interact with magnets through their electric charges. When ions have a positive or negative charge, they can be attracted to or repelled by magnets. This interaction is based on the magnetic field created by the magnet and the electric charge of the ions.
An electric field does positive work on a charged particle when the direction of the electric field is the same as the direction of the particle's movement.
It might help to consider a hole as a positive particle (or rather, quasi-particle). Any positive particle gets attracted by a negative charge, and repelled by a positive charge. Of course, in reality it is the electrons that move, to fill out the hole - but the effect is the same.
The electric field around a charged particle points away from positive charges and towards negative charges.
When a charged particle is placed in an electric field, it experiences a force due to the field. This force causes the particle to accelerate in the direction of the field if the charge is positive, or in the opposite direction if the charge is negative. The motion of the particle will depend on its initial velocity and the strength and direction of the electric field.
positron
A negative point charge will be attracted towards a positive point charge in an electric field.
Everything. A positive charged particle generates an electric field equivalent to the work done in bringing a unit positive charge from infinity to near that charge.
The work done by an electric field on a charged particle can be calculated using the formula: Work = charge of the particle x electric field strength x distance moved. The work is positive if the electric field and the displacement are in the same direction, and negative if they are in opposite directions.
Electric Field between positive and negative charges. If the Electric Field in which both the positive and negative charges are present is stronger than the Electric Field between the two charges we are talking about, the the negative charge will move away from the positive charge in that positive direction of the field. If not, then the negative charge will get attracted to the positive charge and stay at the position of the positive charge. It will be pulled toward the source of the electric field. (Novanet)
It produced a magnetic field. If it's charged, it can be negative OR positive. It's magnetic because if they're both alike signs (both positive or both negative) they repel like magnets. If one particle is positive and one is negative, they attract like magnets.
The charge on the particle can be calculated using the formula F = qE, where F is the force, q is the charge, and E is the electric field strength. Given that the force is the weight of the particle, we can calculate the charge as 8 µC. Since the charge is positive and the electric field is directed upwards, the nature of the charged particle is positive.
A charged particle in an electric field will experience a force that causes it to accelerate in the direction of the field if the charge is positive, or in the opposite direction if the charge is negative. This behavior is described by Newton's laws of motion.