For a charged plane sheet, if the surface charge density is doubled, what happen

Practice Questions

Q1
For a charged plane sheet, if the surface charge density is doubled, what happens to the electric field?
  1. It remains the same
  2. It doubles
  3. It halves
  4. It quadruples

Questions & Step-by-Step Solutions

For a charged plane sheet, if the surface charge density is doubled, what happens to the electric field?
Correct Answer: Electric field doubles.
  • Step 1: Understand what surface charge density (σ) means. It is the amount of charge per unit area on the sheet.
  • Step 2: Know that the electric field (E) created by a charged plane sheet depends on the surface charge density.
  • Step 3: Remember the relationship: Electric field (E) is directly proportional to surface charge density (σ). This means if you change σ, E changes in the same way.
  • Step 4: If the surface charge density (σ) is doubled, it means you have twice as much charge on the same area.
  • Step 5: Since E is directly proportional to σ, if σ is doubled, the electric field (E) will also double.
  • Electric Field of a Charged Plane Sheet – The electric field generated by an infinite plane sheet of charge is given by E = σ / (2ε₀), where σ is the surface charge density and ε₀ is the permittivity of free space.
  • Proportionality of Electric Field to Surface Charge Density – The electric field strength is directly proportional to the surface charge density, meaning that any change in σ will result in a corresponding change in E.
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