When the number of turns in a coil are made 3 times without any change in the length of the coil, its self…
When the number of turns in a coil are made 3 times without any change in the length of the coil, its self inductance becomes
(1.5) times
two times
three times
nine times
Solution
- Formula: Self-inductance $L$ of a coil is proportional to the square of the number of turns ( $N^2$ ).
- Calculation: If the number of turns $N$ is tripled, the new self-inductance becomes $(3 N)^2=$ $9 N^2$. This means the self-inductance becomes nine times the original.