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Two solenoids are given $-1$ st has 1 turn per unit length and 2 nd has $\mathrm{n}$ turns per unit length. Ratio of magnetic fields at their centres is
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The correct answer is:
$1: \mathrm{n}$
Magnetic field $\propto$ no. of turns per unit length
$\therefore \quad$ Required ratio $=1: \mathrm{n}$.
$\therefore \quad$ Required ratio $=1: \mathrm{n}$.
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