Question

Two solenoids are given - 1st has 1 turn per unit length and 2nd has n turns per unit length. Ratio of magnetic fields at their centres is

• A. $n:1$
• B. $1:n$
• C. $1:n^2$
• D. $n^2:1$

Answer 1

Answer: (B)

$1:n$

Magnetic field $\propto$ no. of turns per unit length
$\therefore$ Required ratio =1 : n.