# Electric fields true or false question

• simsima_1
In summary, it is possible to have an electric field without an electric charge, known as an induced electric field. Electric fields and magnetic fields are different types of fields, with electric fields produced by electric charges and magnetic fields produced by moving electric charges. The direction of an electric field is always the same as the direction of the electric force, as the electric field is the force per unit charge. Objects with the same charge repel each other, while opposite charges attract. An electric field can be shielded by surrounding the source with a conducting material, known as electrostatic shielding.
simsima_1

## Homework Statement

The electric fields created by a point charge, a conducting sphere and insulator sphere are identical, if they all have the same amount of charge and the field is measured outside the spheres.

## The Attempt at a Solution

I think its false...but how can you explain it

What is the field (magnitude and direction) at a point, at a distance r from the centre, outside a uniformly charged hollow shell of infinitesimal thickness, if the total charge is q?

...

Your answer is correct. The electric fields created by a point charge, a conducting sphere and insulator sphere are not identical, even if they all have the same amount of charge and the field is measured outside the spheres. This is because the distribution of charge and the material properties of the spheres affect the electric field. A point charge has a concentrated electric field, while a conducting sphere has a uniform electric field on its surface and an insulator sphere has a non-uniform electric field. Additionally, the electric field inside a conducting sphere is zero, while the electric field inside an insulator sphere is non-zero. Therefore, the electric fields created by these different objects are not identical.

## 1. Is it possible to have an electric field without an electric charge?

Yes, it is possible to have an electric field without an electric charge. This is known as an induced electric field, which is created by the movement or change in an existing electric field.

## 2. Are electric fields the same as magnetic fields?

No, electric fields and magnetic fields are two different types of fields. Electric fields are produced by electric charges, while magnetic fields are produced by moving electric charges.

## 3. Is the direction of an electric field always the same as the direction of the electric force?

Yes, the direction of an electric field is always the same as the direction of the electric force. This is because the electric field is the force per unit charge acting on a test charge placed in the field.

## 4. Can objects with the same charge attract each other?

No, objects with the same charge repel each other. This is due to the fact that like charges repel each other, while opposite charges attract each other.

## 5. Can an electric field be shielded?

Yes, an electric field can be shielded. This can be done by surrounding the source of the electric field with a conducting material, which will redirect the electric field lines and prevent them from passing through. This is known as electrostatic shielding.

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