# Capa9 - 1. [1 point, 10 tries] The flexible loop in the...

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1 . [1 point, 10 tries] The flexible loop in the figure below has a radius of 11.6 cm and is in a magnetic field of strength 0.127 T. The loop is grasped at points A and B and stretched until it closes. If it takes 0.240 s to close the loop, find the magnitude of the average induced emf in it during this time. Answer: 2.24e-02 V 2 2 . [1 point, 10 tries] A square, single-turn wire coil L = 1.96 cm on a side is placed inside a solenoid that has a circular cross section of radius r = 2.88 cm, as shown in the figure below. The solenoid is 19.9 cm long and wound with 145 turns of wire. If the current in the solenoid is 3.06 A, find the flux through the coil. Answer: 1.08e-06 T*m^2 2 3 . [1 point, 10 tries] If the current in the solenoid is reduced to zero in 3.48 s, calculate the magnitude of the average induced emf in the coil. Answer: 3.09e-07 V

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4 . [1 point, 10 tries] A single-turn circular loop of radius R = 0.216 m is coaxial with a long 1750 turn solenoid of radius 0.0440 m and length 0.690 m, as seen in the figure below. The variable resistor is changed so that the solenoid current decreases linearly from 5.94 A to 1.49 A in 0.220 s. Calculate the induced emf in the circular lop. (The field just outside the solenoid is small enough to be negligible.) Answer:
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## This note was uploaded on 12/03/2009 for the course CHEMISTRY 1E03 taught by Professor Britz during the Spring '09 term at McMaster University.

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Capa9 - 1. [1 point, 10 tries] The flexible loop in the...

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