JEE Main 20199 AprilMorning Shift
- Exam
- JEE Main
- Year
- 2019
- Date
- 9 April
- Shift
- Morning Shift
- Subject
- Physics
- Chapter
- Electromagnetic Induction
JEE Main 2019 · 9 April · Morning Shift · Physics · Electromagnetic Induction
The total number of turns and cross-section area in a solenoid is...
The total number of turns and cross-section area in a solenoid is fixed. However, its length is varied by adjusting the separation between windings. The inductance of solenoid will be proportional to:
Options
- A
- B
- C
- D
Correct answer
C.
Step-by-step solution
Self-Inductance (n = number of turns per unit length)
^{2}\pi{r}^{2}L= \dfrac{{\mu}_{0}{N}^{2}\pi{r}^{2}}{L}∝ \dfrac{1}{L}
^{2}\pi{r}^{2}L= \dfrac{{\mu}_{0}{N}^{2}\pi{r}^{2}}{L}∝ \dfrac{1}{L}