Why electric field is maximum at the junction?

The maximum electric field occurs at the junction between the p- and n-type material. In other words, if the electric field is confined to the depletion region, then the net charge in Region II must be zero, and hence the negative charge and the positive charge must be equal.

At which point electric field is maximum Why?

In the case of an equipotential surface, the electric field at every point is always normal (to the direction of the electric field (E)). Therefore, the potential at point B is more than C and B. So, the potential at points are VB>VC>VA. Hence, the electric potential at point B is maximum.

Where is the electric field maximum?

A ring of radius (r) is located in the (x-y) plane is given a total charge (Q=2\pi R\lambda). Show that (E) is maximum when the distance (z=r/\sqrt{2}).

How is the electric field across the pn junction?

PN Junction Distance Then the presence of impurity ions on both sides of the junction cause an electric field to be established across this region with the N-side at a positive voltage relative to the P-side. The result of this process is that the PN junction has rectifying current–voltage (IV or I–V) characteristics.

How do I get rid of depletion region?

Forward bias (applying a positive voltage to the P-side with respect to the N-side) narrows the depletion region and lowers the barrier to carrier injection (shown in the figure to the right).

What happens to electric field in reverse bias?

In reverse bias a voltage is applied across the device such that the electric field at the junction increases. The higher electric field in the depletion region decreases the probability that carriers can diffuse from one side of the junction to the other, hence the diffusion current decreases.

Why is the electric field inside a conductor is zero?

Electric field is zero inside a charged conductor. For a charged conductor, the charges will lie on the surface of the conductor.So, there will not be any charges inside the conductor. When there is no charge there will not be electric field.

What is electric field intensity?

A measure of the force exerted by one charged body on another. Imaginary lines of force or electric field lines originate (by convention) on positive charges and terminate on negative charges.

Why do the electric field lines never cross each other?

Electric field lines always point in one direction, at any point. When two lines intersect each other, tangents are drawn at that point indicating two directions of electric field lines, which is impossible therefore electric field lines cannot cross over each other.

What is electric field formula?

Electric field can be considered as an electric property associated with each point in the space where a charge is present in any form. An electric field is also described as the electric force per unit charge. The formula of electric field is given as; E = F /Q.

Why is there a built in electric field in a PN junction?

As the electrons in the n-type material diffuse across towards the p-type side, they leave behind positively charged phosphorus ions, near the interface between the n and p regions. As they cross the junction, the fixed ions they leave behind establish a “built-in” electric field at the junction.