Which force field can increase a moving electron’s speed?

What forces are developed by a moving electron?

The electromagnetic force, also called the Lorentz force, explains how both moving and stationary charged particles interact.

Can a magnetic field increase the speed of a moving particle?

The reason is that the magnetic field doesn’t affect the speed is because the magnetic field applies a force perpendicular to the velocity. Hence, the force can’t do work on the particle. As a result, the particle can’t change its kinetic energy. So it can not change the speed.

Where is a force field the strongest?

The magnetic field of a bar magnet is strongest at either pole of the magnet. It is equally strong at the north pole when compared with the south pole. The force is weaker in the middle of the magnet and halfway between the pole and the center.

What is the force that can cause two pieces of iron to attract each other?

The two pieces of iron attract each other due to the presence of magnetic force. We know that the two like poles repels and two unlike poles repels each other.

What keeps the wire coil spinning?

When you give the coil a spin, since one side of the wire is insulated, you break the circuit briefly, so the coil continues to rotate using its momentum. When the circuit is complete again, the magnetic field once again repels the coil, so it keeps spinning.

What is the direction of Lorentz force?

The Lorentz Force on an electric charge occurs when the charge moves through a magnetic field. This force is perpendicular to the direction of the charge and also perpendicular to the direction of the magnetic field. … The direction of the force is demonstrated by the Right Hand Rule.

When Lorentz force is maximum and minimum?

There is no force when ϕ = 0 or 180°, both of which correspond to a current along a direction parallel to the field. The force is at a maximum when the current and field are perpendicular to each other. The force is given by dF= idl × B.

What is motional EMF?

An emf induced by motion relative to a magnetic field B is called a motional emf and is given by. emf = Bℓv (B,ℓ, and v perpendicular) where ℓ is the length of the object moving at speed v relative to the field.

Why does magnetic field depends on moving charges only?

When charges are stationary, their electric fields do not affect magnets. But, when charges move, they produce magnetic fields that exert forces on other magnets. When there is relative motion, a connection between electric and magnetic fields emerges—each affects the other.

Does magnetic field change velocity?

The magnetic force is perpendicular to the velocity, and so velocity changes in direction but not magnitude. Uniform circular motion results. The component of the velocity parallel to the field is unaffected, since the magnetic force is zero for motion parallel to the field.

Can electric field change velocity?

The electric field will exert a force that accelerates the charged particle. The electric field has a direction, positive to negative. … If a positive charge is moving in the same direction as the electric field vector the particle’s velocity will increase. If it is moving in the opposite direction it will decelerate.

Can a force field be made?

Although the force fields used in science fiction may not conform to the known laws of physics, there are still loopholes that might make the creation of such a force field possible. First, there may be a fifth force, still unseen in the laboratory.

What change the direction of force?

Forces affect how objects move. They may cause motion; they may also slow, stop, or change the direction of motion of an object that is already moving. Since force cause changes in the speed or direction of an object, we can say that forces cause changes in velocity. … So forces cause acceleration.

What happens when two magnetic fields interact?

When opposite ends of two magnets interact, their field lines connect the north pole of one with the south pole of another, and the two attract. When the same ends of two magnets interact, they repel because the lines cannot cross and are compressed by each other.

Why do like poles repel?

When two like-poles point together, the arrows from the two magnets point in OPPOSITE directions and the field lines cannot join up. So the magnets will push apart (repel).

Which substance does not attract the magnet?

Metals that have iron in them attract magnets well. Steel is one. Metals like brass, copper, zinc and aluminum are not attracted to magnets. Non-magnetic materials such as wood and glass are not attracted to magnets as they do not have magnetic materials in them.

How can you make a motor spin faster?

A faster motor. One easy way to make the motor run faster is to add another magnet. Hold a magnet over the top of the motor while it is running. As you move the magnet closer to the spinning coil, one of two things will happen.

How can we increase the power of DC motor?

The power of the DC motor increases by increasing the torque developed by the shaft/rotor which in turn depends on the current in direct proportion.

Does an electric motor turn faster if you increase the current?

Does an electric motor turn faster if you increase the current? … As more current flows through the motor’s electromagnet, the strength of the magnetic field increases, thus turning the motor faster.

What is B in Lorentz force?

The magnetic field B is defined from the Lorentz Force Law, and specifically from the magnetic force on a moving charge: … The magnitude of the force is F = qvB sinθ where θ is the angle < 180 degrees between the velocity and the magnetic field.