Question

1 marks
Q.No:1
How to increase the energy stored in an inductor
by four times?
A) By doubling the current
B) This is not possible
C) By doubling the inductance
D) By making current 2- times​

Answer 1

Answer:A

Explanation:

The energy stored in a inductor is 1/2LI^2 . On doubling the current, the energy stored will become 4 times.

Answer 2

By doubling the current, the energy stored in an inductor can be increased (Option A and D)

• Energy stored inside an inductor expressed as:

$Energy in the inductor(E)= \frac{1}{2}LI^{2}$

• Here, L indicates the inductance (represented in Henry) and I indicates the current (represented in Ampere).
• According to options A and D, on doubling the current or making the current two times, we get,

E= $\frac{1}{2} L (2I)^{2}$

⇒E=$2 L I^{2}$

• According to option C, on doubling the inductance, we get

E= $\frac{1}{2} (2L) I^{2}$

⇒E=$L I^{2}$

• Hence, doubling the current or making it 2 times can increase the energy in an inductor. Therefore, Options A and D are correct.