Electrostatics

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What is the direction of the electric field due to a positive charge?

Perpendicular to the positive charge
In the same direction as the positive charge
Directed towards the positive charge
Directed away from the positive charge (correct)

If two charged spheres are connected by a wire, what happens to their potential?

Their potential becomes unequal
Their potential remains the same
Their potential is zero
Their potential becomes equal (correct)

What is the ratio of electric field of two charged spheres of radius R1 and R2?

R1^2 / R2^2
R2^2 / R1^2
R1 / R2
R2 / R1 (correct)

To produce an electric field of 0.036 N/C just above the surface of a spherical conductor, how many electrons need to be put on it?

2.5 × 10^5 (A) Signup and view all the answers

What is the unit of charge in the given examples?

Coulomb (C) Signup and view all the answers

What is the net electric field at the centre of a cube with eight equal charges +Q at its corners?

Zero (A) Signup and view all the answers

What type of charge is present at the vertex A in Example 34?

Neutral charge (A) Signup and view all the answers

What is the potential at the centre of the uncharged conducting sphere due to the induced charge?

0 (B) Signup and view all the answers

What is the property of charge that is used to find the potential at the centre of the circle in Example 33?

Superposition (D) Signup and view all the answers

What is the charge at the surface of the atomic nucleus in Example 32?

1.6 × 10^-19 C (C) Signup and view all the answers

What is the direction of the electric field due to a point charge?

Radially outward from the charge (D) Signup and view all the answers

What is the net induced charge on the uncharged conducting sphere?

0 (A) Signup and view all the answers

What is the charge at point C in Example 34?

-q (B) Signup and view all the answers

What is the potential at a point outside a concentric sphere due to the charges on the sphere?

1 q / 4πε0r (D) Signup and view all the answers

What is the principle used to find the net potential at a point due to multiple concentric spheres?

Principle of Superposition (C) Signup and view all the answers

What is the condition for the maximum force of repulsion between two charges Q1 and Q2 placed at a distance R from each other?

Q1 = Q2 (A) Signup and view all the answers

If the initial force between two charges is F, and they are moved towards each other by a certain distance, what is the relation between the initial and final forces?

F1 / F2 = r1^2 / r2^2 (A) Signup and view all the answers

If the ratio of the initial to the final force between two charges is 4:1, what is the ratio of the initial to the final distance between them?

1:2 (C) Signup and view all the answers

What is the effect on the force between two charges if the magnitude of one of the charges is doubled?

The force is quadrupled (D) Signup and view all the answers

If two charges of equal magnitude and opposite polarity are placed at a certain distance apart, what is the nature of the force acting between them?

Attractive force (A) Signup and view all the answers

What is the physical quantity represented by 𝜀₀ in Coulomb's law?

Permittivity of free space (D) Signup and view all the answers

A dielectric medium is partially filled between two charges. What is the effective air separation between the charges?

(r - t + tK) (B) Signup and view all the answers

What is the direction of the force in Coulomb's law?

Along the unit vector from the first charge to the second charge (C) Signup and view all the answers

What is the relative strength of the electromagnetic force compared to the gravitational force?

10^(37) (B) Signup and view all the answers

What is the range of the nuclear force?

Short range, up to 10^(-15) meters (C) Signup and view all the answers

What is the net force on a point charge due to four identical point charges placed at the vertices of a regular tetrahedron?

Zero (C) Signup and view all the answers

A point charge +Q is placed at the centre of a regular hexagon of side L. What is the magnitude of the force on a point charge –q placed at one of the vertices of the hexagon?

$$\frac{kQq}{L^2}$$ (A) Signup and view all the answers

Two identical small spheres, each having charge +Q, are kept at a certain distance. What is the force between them?

$$\frac{kQ^2}{L^2}$$ (D) Signup and view all the answers

A point charge +Q is placed at the centre of a regular octagon of side L. What is the magnitude of the force on a point charge –q placed at one of the vertices of the octagon?