Physics 1 Marks Question

This value will remain unchanged because the charge enclosed by the Gaussian surface remains the same.

It means that the value of electric flux towards inside is equal to the electric flux towards outside.

Yes, it experiences a force in a non-uniform electric field.

While walking, our feet rub on the mat, due to which our body gets charged. When we touch the handle, electric charge from our body flows into it, due to which we get a shock.

(i) Both the charges should be of opposite nature.(ii) The magnitude of the charge located near that point should be less and the magnitude of the other charge should be greater.

(1) Charge can be zero, positive or negative but mass is always positive.
(ii) Electric charge does not depend on the velocity of motion of the particle whereas mass also depends on the velocity of motion of the particle.

The repulsion forces between two protons and two electrons will be equal because the magnitude of charge on the proton and electron is equal and the distances between them are also equal.

Electron, because the mass of electron is less.

The potential is the same at all points within the spherical surface and its value is the same as that on the surface of a spherical charge, that is, the value of the potential at a distance of 5 cm from its centre will be 10 Volt.

(i) The tangent drawn at any point to the line of electric force expresses the direction of the resultant electric field at that point.
(ii) Electric lines of force run from positive charge and end at netative charge.
Note: Students can also write other properties of electric field lines.

No, because the entire charge of a charged conductor is always on the outer surface of the conductor.

No

The principle of Gaussian surface helps in finding the intensity of electric field due to symmetric charge distribution.

It is a region around a charge in which the electric field intensity is equal at all points and the electric flux is always perpendicular to the surface.

Zero

From negative to positive charge.

A pair of very close point charges, equal in magnitude and opposite in nature, is called an electric dipole. Its unit is Coulomb meter.

In a uniform electric field, the lines of force are straight lines, parallel and at equal distances. As shown in the Fig


Also see question 30. i.e. the non-uniform electric field.

Both the magnitude and direction of the electric field are variable. i.e. the electric field is non-uniform.

Lines of force do not intersect each other, because if they intersect then two tangent lines at the intersection point will express two resultant fields, which is impossible.

Electric field intensity

Electric field intensity is a vector quantity

Infinite

Compared to the normal state, the lack of electrons in an object shows that it is positively charged and the excess of electrons shows that it is negatively charged.

If the dielectric constant of any one medium increases. So the force between the point charges will decrease.

Yes, a charged body, by induction, produces a charge of opposite nature on the nearby surface of the un- charged body and of the same nature on the distant surface, due to which a net attractive force starts appearing between them.