What is Electric value of K?

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Electric Value of K refers to the physical constant known as Coulomb’s constant, denoted by the symbol K. It plays a crucial role in the field of electrostatics and helps us calculate the force between two electric charges. Coulomb’s constant is an indispensable component in the mathematical representation of the electrostatic force equation.

The constant value K is usually derived from other fundamental physical constants like the permittivity of free space (ε₀) and the speed of light (c). Coulomb’s constant can be mathematically expressed as:

K = 1 / (4πε₀)

Where ε₀ is the permittivity of free space and is approximately equal to 8.854 x 10⁻¹² F/m.

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FAQs:

Q: What is electrostatic force?

A: Electrostatic force refers to the force of attraction or repulsion between two charged objects due to their electric charge.

Q: How is Coulomb’s constant used?

A: Coulomb’s constant is used to calculate the force between electric charges using the formula: F = (K * q₁ * q₂) / r², where F is the force, q₁ and q₂ are the charges, and r is the distance between them.

Q: What are the units of Coulomb’s constant?

A: The SI units of Coulomb’s constant, K, are Nm²/C².

Q: Can Coulomb’s constant value change?

A: No, Coulomb’s constant is considered a fundamental constant of nature and does not change.

Q: What is the magnitude of Coulomb’s constant?

A: The magnitude of Coulomb’s constant is approximately 8.9875 x 10^9 Nm²/C².

Q: How is Coulomb’s constant related to electric field?

A: Coulomb’s constant is not directly related to the electric field. However, it is used to calculate the electric field intensity produced by a point charge.

Q: Can Coulomb’s constant be used for moving charges or only for static charges?

A: Coulomb’s constant is primarily used for static charges, as it is specifically derived for static situations.

Q: Is Coulomb’s constant applicable only for point charges?

A: Coulomb’s constant is most accurate when applied to point charges. However, it can still provide a reasonable approximation for charged objects with finite dimensions.

Q: How is Coulomb’s constant related to the electromagnetic force?

A: Coulomb’s constant is responsible for the electrostatic part of the electromagnetic force equation, which also includes the magnetic force component.

Q: Why is Coulomb’s constant important?

A: Coulomb’s constant is essential for understanding and calculating the electrostatic forces between charged objects, allowing us to model and predict various electrical phenomena.

Q: Are there any alternative forms of Coulomb’s constant?

A: No, Coulomb’s constant only has one accepted value, which is derived from the permittivity of free space.

Q: How was Coulomb’s constant historically determined?

A: The value of Coulomb’s constant was first experimentally determined by the French physicist Charles-Augustin de Coulomb in the late 18th century using a torsion balance.

Q: Can Coulomb’s constant be used in non-vacuum environments?

A: Coulomb’s constant can be used in any medium because it is implicitly related to the permittivity of free space, which accounts for the properties of the medium. However, some adjustments may be required depending on the medium’s relative permittivity.

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