Question

When the number of turns per unit length in a solenoid is doubled then its coefficient of self induction will become

• A. half
• B. double
• C. four times
• D. unchanged

Answer 1

Answer: (C)

four times

Coefficient of Self inductance is directly proportional to square of number of turns in coil, hence on doubling the number of turns. Coefficient of Self inductance becomes four times.