Question

Energy in a current-carrying coil is stored in the form of
A. Magnetic Field
B. Heat
C. Electric field
D. Dielectric strength

Answer 1

Hint: A passive two-terminal compound that is made of an electrical conductor such as a wire wound into a coil is called an inductor. So this can be said as a current-carrying coil. If we understand what type of energy the inductor stores then we can conclude what form of energy a current-carrying coil will have.

Complete answer:
Basically, an inductor uses a conductor that is wound into a coil. When the electricity flows into the coil from the left to right this, in turn, will generate a magnetic field. The direction of the magnetic field will be in the clockwise direction. An inductor is a device that is capable of storing electrical energy in the form of a magnetic field.
We know that solenoid is a long cylindrical coil of wire. It consists of a large number of turns bound together tightly. When we pass current into the solenoid a magnetic field is created around it. A solenoid is another term used for the inductor.
A current-carrying will not always carry the electric charge but it always generates a magnetic field. Therefore we can conclude that the energy in a current-carrying wire is stored in the form of the magnetic field.
The correct option is A.

Note: We have seen that the magnetic field is generated by the current-carrying coil. This generated magnetic itself affects the current that generated it. The energy stored in the inductor will be equal to the total amount of work required to establish the current through the inductor, and therefore the magnetic field. This can be established by the following relation:
\[E = \dfrac{1}{2}L{I^2}\]
Here, \[L\] is the inductance and \[I\] is current through the inductor.