Q1: In studies of the possibility of migrating birds using the Earth’s magnetic field for navigation, birds have been fitted with coils as “caps” and “col- lars” as shown in Figure P30.1.
(a) If the identical coils have radii of cm and are cm apart, with turns of wire apiece, what current should they both carry to produce a magnetic field of T halfway between them?
(b) If the resistance of each coil is V, what voltage should the battery supply- ing each coil have?
(c) What power is delivered to each coil?
pi =
g =
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