Hand In 5 Solutions(07)

# Hand In 5 Solutions(07) - Solutions for Hand-In Set#5 PHYS...

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Solutions for Hand-In Set #5 PHYS 212 – Spring 2007 A27 — Electromagnetic Waves and You Some examples of electromagnetic waves affecting life: Sunlight carrying energy from the sun via electro- magnetic waves; Wireless communications; Cell phones; Radio-controlled remote-control toys; Microwave ovens; Fiber-optic communication links; Radio/TV transmissions; X-Rays at doctor or dentist; IR link on Palm Pilot; Gamma ray hazards from radioactive materi- als/nuclear explosions; Infrared heat lamps to warm food (or bodies); . . . A28 — Falling Loops An expression for the magnitude of the induced emf in the falling loop is derived in the solution of problem 28-90 from your text (see below): |E| = NB 0 w | v | , and the magnitude of the induced current is I = E R = NB 0 w | v | R . (In this problem N = 1.) F mag = IwB F grav = mg Two forces act on the loop: the force of gravity acts down, and there is an upward directed magnetic force acting on the counterclockwise current. Newton’s second law gives F net =

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