Experimental tests have shown that hammerhead sharks can detect magnetic fields.

Question

Experimental tests have shown that hammerhead sharks can detect magnetic fields. In one test, 183 turns of wire are wrapped around a 5.5-m-long cylindrical tank. A magnetic field was created inside the tank when this coil of wire carried a current of 3.8 A. Sharks trained by getting a good reward when the field was present would later unambiguously respond when the field was turned on. What was the magnetic field strength in the center of the tank due to the current of the coil? Based on the answer to your previous answer, complete the following sentence: "Hammerhead sharks (can/cannot) detect the Earth's magnetic field because the magnetic field in the tank is comparable) to the Earth's magnetic field of 5.0 Times 10^-5 T."

Explanation / Answer

B = u0 (N/L) I

u0 = 4pi x 10^-7

N = 183 turns

L = 5.5m

I = 3.8 A

B = 4pi x 10^-7 x ( 183 / 5.5) x 3.8   =1.59 x 10^-4 T

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