A hollow sphere of copper is positively charged. Then the electric field inside the sphere is
Correct answer: D. Less than the field at the surface but not zero(d) Zero
- A. The same as the field at the surface
- B. Greater than the field at the surface
- C. Less than the field at the surface but not zero
- D. Less than the field at the surface but not zero(d) Zero
Explanation
In a hollow conducting sphere, the electric field inside the sphere is zero. This is due to the principle of electrostatic equilibrium and Gauss's law, which states that there is no net electric field inside a conductor in electrostatic equilibrium.The formula for Gauss's Law in integral form is:∮ E ⋅ dA = Q / ε₀where:∮: Represents a closed surface integral, meaning the integration is carried out over a closed surface (often called a Gaussian surface).E: Electric field vector (N/C) at a point on the surface.dA: Infinitesimal area element of the surface. The dot product (⋅) indicates that the electric field vector is integrated over the component of the area element perpendicular to the field.
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Electrostatics describes forces between charges through Coulomb's law, electric fields and field intensity, then uses electric potential to measure energy per unit charge. Capacitors store charge and electrical energy, with capacitance depending on geometry and dielectric material, not simply on the amount of charge present.
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