We Find That N Current Loops Are Coplanar and Coaxial

question 19

Multiple Choice

We find that N current loops are coplanar and coaxial.The first has radius a and current I.The second has radius 2a and current 2I, and the pattern is repeated up to the Nth, which has radius Na and current NI.The current in each loop is counter clockwise as seen from above.The magnitude of the magnetic field at the centre of the loops is:

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