You have been asked to consult on a zoology experiment. An investigator wants to

Question

You have been asked to consult on a zoology experiment. An investigator wants to examine the role of the earth's magnetic field on pigeon behavior, and asks you to build a 1.0 m long solenoid of radius r = 1.0 m to fit over the pigeon coop. The solenoid is to be approximately lined up so that it can exaclty cancel the earths magnetic field by creating an exact equal and opposite magnetic field. If your batteries can readily supply 0.25A, how many turns must you wind into the solenoid to produce the required fields

Explanation / Answer

the magnetic field of a solenoid is B = (oN * I/l) or N = (B * l/o* I) -----------(1) B is the magnetic field created by the solenoid and is equalto the earths magnetic field l is length of solenoid o is permeability of vacuum and is equal to4 * 10^-7 N/A^2 I is current supplied by the batteries and is equal to 0.25A substitute the values in equation (1)

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