Question

An inductor may store energy in

• A. its electric field
• B. its coils
• C. its magnetic field
• D. both in electric and magnetic fields

Answer 1

The Correct Option is C

An inductor can store energy due to its ability to create a magnetic field when an electric current passes through it. This concept is fundamental in electromagnetism and electrical engineering. 

• Explanation: When current flows through an inductor, a magnetic field is created around the coil. Energy is stored in this magnetic field. The inductor resists changes in the current, which is why it can store energy for a while and release it when necessary.
• Energy Storage in an Inductor: The energy \(E\) stored in an inductor is given by the formula: \(E = \frac{1}{2} L I^2\), where \(L\) is the inductance in henries, and \(I\) is the current in amperes.
• Magnetic Field: The magnetic field is confined to the area around the coil. The effectiveness of energy storage depends on the inductance and the current passing through it.
• Incorrect Options:
  • its electric field: Inductors do not store energy in an electric field; capacitors do.
  • its coils: The coil itself is simply a conductor and not the medium where energy is stored.
  • both in electric and magnetic fields: Inductors exclusively store energy in magnetic fields.

Thus, the correct answer is that an inductor stores energy in its magnetic field, as per the principles of electromagnetism.