If E be the electric intensity of an electrostatic field, then the electrostatic energy density is proportional to:
Correct answer: B. E²
- A. E
- B. E²
- C. 1/E²
- D. E³
Explanation
The energy density (energy per unit volume) stored in an electric field is given by the formula u = (1/2)ε₀E². This shows that the energy density is directly proportional to the square of the electric field intensity (E²).
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Electrostatics
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.
Practise Electrostatics
831 free Electrostatics MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Electrostatics questions
The coulombs force between two point charges, If magnitude of each charge is doubled and distance between charges is halved, the force between them becomes:
Relative permittivity εr is defined by the following relation:
Electric potential is:
A tin nucleus has a charge of +50e. If a proton is at a distance 10⁻¹² m from the nucleus, then the potential V at this position is (charge on the proton = 1.6 x 10⁻¹⁹ C:
An external agency carries '-5C' of charge from infinity to a point in an electrostatic field and performs 100 joules of work. The potential at the given point is:
Three charges 2q,-q,-q are located at the vertices of an equilateral triangle. At the centre of the triangle: