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## Homework Statement

Can I derive an equation for magnetic field inside a solenoid using the formula for magnetic field on the axis of a current carrying coil?

## Homework Equations

B = μI/2r ( Magnetic field at the centre of a current carrying coil)

## The Attempt at a Solution

B = μI/2r

Let the number of turns per unit length of the solenoid be 'n' and its length be 'a'

So,

B = μnaI/2r

Which is definitely not equal to μnI (Calculated using Ampere's Circuital Law)

What's wrong?[/B]