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Question 4 (1 points) (#524105-12) {Biot-Savart Law} / {Current Loop} A at, circular loop has 20 turns (the wire circles around 20 times). The radius of the loop is 18.7 cm and the current through the wire is 0.740 A. Determine the magnitude of the magnetic eld at the center of the loop. Please enter a numerical answer below. Accepted formats are numbers or \"e" based scientic notation e.g. 0.23, 2, 1e6, 5.23e8 Enter answer here >