In Region II, between the charges, both vectors point in the same direction so there is no possibility of cancelling out. In Region III, the fields again point in opposite directions and there is a point where their magnitudes are the same. It is at this point where the net electric field is zero.

## Can a magnetic field be zero?

It’s not really true that magnetic field lines cannot cross, but where they do, the magnetic field strength has to be zero. Here’s why: A magnetic field line is that path in space that points in the direction of the magnetic field at every point along it. … Magnetic field lines tend to follow closed loops, though.

## Why is the magnetic field zero?

If the magnitude and direction of the velocity of the particle are constant, then the particle has zero acceleration. From Newton’s second law, we know that the net force on the particle is zero. But there is no magnetic field and, hence, no magnetic force. Therefore, the net force is the electric force.

## Where is the magnetic field zero between two wires?

Two wires carry currents in the same direction as shown below. Where are the points where the magnetic field is zero? Solution: Using the right-hand rule, will convince one that the magnetic field contriubtions from the two wires only cancel in the region between the wires.

## What is the formula of magnetic field?

The magnetic field formula contains the c o n s t a n t μ 0 constant^{mu_{0}} constantμ0. This is known as permeability of free space and has a v a l u e 0 μ value^{mu}_{0} value0μ = 4 π × 1 0 − 7 ( T ⋅ m 4pi times 10^{ -7} (T cdot m 4π×10−7(T⋅m/ A).

## Why can’t magnetic field lines cross?

Magnetic field lines can never cross, meaning that the field is unique at any point in space. Magnetic field lines are continuous, forming closed loops without beginning or end. They go from the north pole to the south pole.

## Can magnets interact without touching?

Magnetic forces are non contact forces; they pull or push on objects without touching them. Magnets are only attracted to a few ‘magnetic’ metals and not all matter. Magnets are attracted to and repel other magnets.

## Why is electric field perpendicular to magnetic field?

Also according to Faraday’s law of electromagnetic induction, changing magnetic field will create an electric field perpendicular to it’s direction. That is why in an electromagnetic wave, electric and magnetic fields promote each other in directions perpendicular to themselves. So they are perpendicular.

## Under what conditions is the magnetic force zero?

The magnitude and direction of the magnetic force depends on the particle velocity and magnitude and direction of the magnetic field. Force is zero when velocity and field are in same direction. When velocity and field make angle θ the force acts in direction perpendicular to both.

## What is the magnetic flux through a closed surface?

Gauss’s law for magnetism, which is one of the four Maxwell’s equations, states that the total magnetic flux through a closed surface is equal to zero. (A “closed surface” is a surface that completely encloses a volume(s) with no holes.)

## Do magnetic fields cancel out?

Outside the wires, the two magnetic fields from the two currents are in opposite directions so they will tend to cancel each other and the resulting or total magnetic field will be small. Q4 Explain why two parallel wires carrying currents in opposite directions repel each other.

## How do magnetic fields combine?

Nearby magnets

When magnets are close together, with their fields overlapping, the fields combine to produce a resultant field which acts in one direction at any given point.

## How do you calculate the magnetic field between two wires?

To determine the net magnetic field midway between the two wires, we must determine the magnetic field as a result of each wire and then take the sum of those two vectors. Since the electric current runs in opposite direction in both wires, to determine the total magnetic field we need to subtract the two vectors.

## What is SI unit of magnetic field?

tesla

## What is called magnetic field?

A magnetic field is a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials. … The effects of magnetic fields are commonly seen in permanent magnets, which pull on ferromagnetic materials such as iron, and attract or repel other magnets.

## Where is the magnetic field strongest?

The magnetic field is strongest at the center and weakest between the two poles just outside the bar magnet. The magnetic field lines are densest at the center and least dense between the two poles just outside the bar magnet.