Crocodiles are thought to be able to detect changes in the flux due to Earth\'s

Question

Crocodiles are thought to be able to detect changes in the flux due to Earth's magnetic field as they move their heads. Suppose acrocodile is initially facing north. The horizontal component of Earth's magnetic field is 30 T. Consider a vertical, circular loop of neurons inside the crocodile's head with radius 11 cm. The loop is initially perpendicular to the horizontal component of Earth's magnetic field. The crocodile rotates its head 90° until it is facing east in a time interval of 2.2 s. What is the average emf induced around this loop of neurons? Round your answer to two decimal places.

Explanation / Answer

Horizontal component of earth magnetic field = 30 micro Tesla = 30× 10-6 T

Radius of circular loop = 11 cm = 0.11 m

Area of the loop = (0.11)2 = 0.038 m2

Change in flux = 30×10-6 ×0.038 = 1.14× 10-6

Time interval of rotation = 2.2 seconds

Average emf induced = change in flux / time = 0.52 × 10-6 volt

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