- 1(current)
Q. No.The current in an inductor of self-inductance \(4~\text{H}\) changes from \(4~ \text{A}\) to \(2~\text{A}\) in \(1~ \text s\). The emf induced in the coil is:
| 1. | \(-2~\text{V}\) | 2. | \(2~\text{V}\) |
| 3. | \(-4~\text{V}\) | 4. | \(8~\text{V}\) |
Subtopic: Â Self - Inductance |
 85%
Level 1: 80%+
NEET - 2022
Hints
The self-inductance of a long solenoid of cross-section \(A,\) total length \(L\) and total number of turns \(N,\) is (approximately):
| 1. | \(\dfrac{\mu_0A}{L}\cdot N\) | 2. | \(\dfrac{\mu_0A}{L}\cdot N^2\) |
| 3. | \(\dfrac{\mu_0L^3}{A}\cdot N\) | 4. | \(\dfrac{\mu_0L^3}{A}\cdot N^2\) |
Subtopic: Â Self - Inductance |
 81%
Level 1: 80%+
Hints
A current of \(2.5~\text A\) flows through a coil of inductance \(5~\text H.\) The magnetic flux linked with the coil is:
1. \(0.5~\text{Wb}\)
2. \(12.5~\text{Wb}\)
3. zero
4. \(2~\text{Wb}\)
1. \(0.5~\text{Wb}\)
2. \(12.5~\text{Wb}\)
3. zero
4. \(2~\text{Wb}\)
Subtopic: Â Self - Inductance |
 85%
Level 1: 80%+
NEET - 2013
Hints
The current \((I)\) in the inductance is varying with time \((t)\) according to the plot shown in the figure.
Which one of the following is the correct variation of voltage with time in the coil?
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Â Self - Inductance |
 74%
Level 2: 60%+
AIPMT - 2012
Hints
Links
The expression for the magnetic energy stored in a solenoid in terms of magnetic field \(B\), area \(A\) and length \(l\) of the solenoid is:
| 1. | \( \dfrac{1}{\mu_0}B^2Al\) | 2. | \( \dfrac{1}{2\mu_0}B^2Al\) |
| 3. | \( \dfrac{2}{\mu_0}B^2Al\) | 4. | \( \dfrac{3}{2\mu_0}B^2Al\) |
Subtopic: Â Self - Inductance |
 84%
Level 1: 80%+
Hints
Links
The magnetic potential energy stored in a certain inductor is \(25~\text{mJ},\) when the current in the inductor is \(60~\text{mA}.\) This inductor is of inductance:
| 1. | \(0.138~\text H\) | 2. | \(138.88~\text H\) |
| 3. | \(1.389~\text H\) | 4. | \(13.89~\text H\) |
Subtopic: Â Self - Inductance |
 72%
Level 2: 60%+
NEET - 2018
Hints
Links
- 1(current)
Q. No.
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