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## Homework Statement

Metal cylinder of radius a has the z-axis as its symmetry. It has magnetic field at any point P as: $$B[x,y,z] = \frac{1}{2} \mu_0 J_z [-ye_x + xe_y]$$

A cylindrical hole of radius b which is displaced from the cylinder's axis by d in the x direction. The magnetic field inside the hole is $$B = \frac{1}{2}\mu_0 J_z de_y$$

Does the field inside the hole make sense in the limit as d tends to zero? Explain why in 2 or 3 sentences.

## Homework Equations

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Deriving the field in the hole from the field in the cylinder using superposition gave, $$B = \frac{1}{2} \mu_0 J_z [-ye_x +xe_y + ye_x - [x-d]e_y]$$

## The Attempt at a Solution

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So as d tends to zero the axis of the hole is moving to the centre of the cylinder and just leaves us with $$ B = \frac{1}{2} \mu_0 J_z$$? I'm not quite sure what the question is asking here. Any suggestions please?