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K.QMUL

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## Homework Statement

An infinitely long hollow cylinder of radius a carries a constant current I. Use Biot-Savart's law

and show that the magnetic field at the centre of the cylinder is zero.

## Homework Equations

Biot-Savart's law

## The Attempt at a Solution

I cannot seem to come up with anything meaningful. I have tried searching this question but it seems the best way is normally to use Ampere's law and not Biot-Savarts law. Could someone explain the steps or show the steps how we could use Biot-Savart's law in this case.