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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 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?
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?
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?
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 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 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 principle of superposition in electrostatics?
What is the ratio of the gravitational force and electrostatic force between two electrons?
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?
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?
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?
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?
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?
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?
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 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 direction of the force vector in Coulomb's Law?
What is the unit of the permittivity of free space?
What is the unit of the permittivity of free space?
What is the nature of the electromagnetic force?
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 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 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 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?
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?
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?
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?
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 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 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 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 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?
What is the potential at the surface of a sphere of radius a with a charge +Q?
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