Electrostatics

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What is the effective air separation between the charges when a dielectric medium of thickness t is partially filled between them?

r - t + t/K

r - t + tK (correct)

r - t/K

r - t

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

10^24

10^37 (correct)

10^(-37)

10^(-24)

What is the property of the electromagnetic force that distinguishes it from the gravitational force?

It is always repulsive

It is only between masses

It can be both attractive and repulsive (correct)

It is always attractive

What is the unit vector in the vector form of Coulomb's Law?

r̂12 Signup and view all the answers

What is the condition for Coulomb's law to be valid?

At a distance greater than 10^-15 m Signup and view all the answers

What happens to the force of Q1 exerted on Q2 when a third charge Q3 is brought near?

It remains unchanged Signup and view all the answers

What is the principle of superposition in electrostatics?

Total force is the vector sum of individual forces Signup and view all the answers

What is the ratio of the gravitational force and electrostatic force between two electrons?

10^43/1 Signup and view all the answers

What is the final force between two point charges if a charge of -5 μC is added to each of them, initially repelling each other with a force of 40 N?

-10 N Signup and view all the answers

Two small balls having equal positive charge Q on each are suspended by two insulated strings of equal length L. In a state of weightlessness, what is the angle between the strings?

180° Signup and view all the answers

What is the ratio of forces acting on two point charges of 1 μC and 5 μC, separated by a certain distance?

1:1 Signup and view all the answers

Two charges of 40 μC and -20 μC are placed at a certain distance apart. What happens to the force between them when they are touched and kept at the same distance?

The force becomes zero Signup and view all the answers

What is the expression for the force between two point charges according to Coulomb's Law?

F = k × (Q1 × Q2) / r^2 Signup and view all the answers

If the dielectric medium is partially filled between two charges, what is the effective air separation between the charges?

r - t + tK Signup and view all the answers

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

10^37 Signup and view all the answers

What is the direction of the force vector in Coulomb's Law?

Along the line joining the two charges Signup and view all the answers

What is the unit of the permittivity of free space?

Farad per meter Signup and view all the answers

What is the nature of the electromagnetic force?

Both attractive and repulsive Signup and view all the answers

What is the direction of the force exerted by a point charge on another point charge?

Radial to the line joining the two charges. Signup and view all the answers

What is the condition for the principle of superposition to be valid?

The charges must be stationary. Signup and view all the answers

What is the ratio of the electrostatic force and the gravitational force between two protons?

10^36 : 1 Signup and view all the answers

What is the force between two point charges of 3 μC and 8 μC, if they are initially repelling each other with a force of 40 N?

40 N Signup and view all the answers

If two point charges of 1 μC and 5 μC are separated by a certain distance, what is the ratio of the electric field at a point midway between them?

1:5 Signup and view all the answers

Two small balls having equal positive charge Q on each are suspended by two insulated strings of equal length L. In a state of weightlessness, what is the tension in the strings?

Q²/4πε₀L² Signup and view all the answers

If a charge of -5 μC is added to each of two point charges of 3 μC and 8 μC, initially repelling each other with a force of 40 N, what is the new force between them?

-10 N Signup and view all the answers

What is the change in potential at the surface of the shell when it is given a charge of –3Q?

–3Q / 4πε₀b Signup and view all the answers

What is the electric field at the surface of a charged sphere?

Q / 4πε₀r² Signup and view all the answers

Electrostatics

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Questions and Answers

What is the effective air separation between the charges when a dielectric medium of thickness t is partially filled between them?

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

What is the property of the electromagnetic force that distinguishes it from the gravitational force?

What is the unit vector in the vector form of Coulomb's Law?

What is the condition for Coulomb's law to be valid?

What happens to the force of Q1 exerted on Q2 when a third charge Q3 is brought near?

What is the principle of superposition in electrostatics?

What is the ratio of the gravitational force and electrostatic force between two electrons?

What is the final force between two point charges if a charge of -5 μC is added to each of them, initially repelling each other with a force of 40 N?

Two small balls having equal positive charge Q on each are suspended by two insulated strings of equal length L. In a state of weightlessness, what is the angle between the strings?

What is the ratio of forces acting on two point charges of 1 μC and 5 μC, separated by a certain distance?

Two charges of 40 μC and -20 μC are placed at a certain distance apart. What happens to the force between them when they are touched and kept at the same distance?

What is the expression for the force between two point charges according to Coulomb's Law?

If the dielectric medium is partially filled between two charges, what is the effective air separation between the charges?

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

What is the direction of the force vector in Coulomb's Law?

What is the unit of the permittivity of free space?

What is the nature of the electromagnetic force?

What is the direction of the force exerted by a point charge on another point charge?

What is the condition for the principle of superposition to be valid?

What is the ratio of the electrostatic force and the gravitational force between two protons?

What is the force between two point charges of 3 μC and 8 μC, if they are initially repelling each other with a force of 40 N?

If two point charges of 1 μC and 5 μC are separated by a certain distance, what is the ratio of the electric field at a point midway between them?

Two small balls having equal positive charge Q on each are suspended by two insulated strings of equal length L. In a state of weightlessness, what is the tension in the strings?

If a charge of -5 μC is added to each of two point charges of 3 μC and 8 μC, initially repelling each other with a force of 40 N, what is the new force between them?

What is the change in potential at the surface of the shell when it is given a charge of –3Q?

What is the electric field at the surface of a charged sphere?

What is the potential difference between two concentric spheres of radii a and b, with charges +Q and –Q respectively?

What is the electric field at a point inside a charged spherical shell?

What is the potential at the surface of a sphere of radius a with a charge +Q?

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