Two identical strong magnets are dropped simultaneously by two students into two vertical tubes of the same dimensions (Fig. 20.30). One tube is made of copper, and the other is made of plastic. From which tube will the magnet emerge first? Why?
Answer to relevant QuestionsBy using the appropriate SI units, show that the units on both sides of Eq. 20.2 (Faraday’s law) are the same. A boy is traveling due north at a constant speed while carrying a metal rod. The rod’s length is oriented in the east– west direction and is parallel to the ground. (a) There will be no induced emf when the rod is (1) ...A simple ac generator consists of a coil with 10 turns (each turn has an area of 50 cm2). The coil rotates in a uniform magnetic field of 350 mT with a frequency of 60 Hz. (a) Write an expression in the form of Eq. 20.5 for ...A 240-V dc motor has an armature whose resistance is 1.50Ω. When running at its operating speed, it draws a current of 16.0 A. (a) What is the back emf of the motor when it is operating normally? (b) What is the starting ...The specifications of a transformer used with a small appliance read as follows: input, 120 V, 6.0 W; output, 9.0 V, 600 mA. (a) Is this transformer (1) an ideal or (2) a nonideal transformer? Why? (b) What is its ...
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