In its daily prowl of the neighborhood, a cat makes a displacement of 120 m due north, followed by a 72-m displacement due west. (a)Find the magnitude and direction of the displacement required for the cat to return home. (b) If, instead, the cat had rst prowled 72 m west and then 120 m north, how would this affect the displacement needed to bring it home? Explain.
Chapter 23: Magnetic Flux and Faraday’s Law of Induction Flux=BAcos (thet) o Unit is Weber (Wb) o B is magnetic field o A is area Magnetic flux if used in the calculation of the induced emf Faraday’s Law: an emf is induced only when the magnetic flux though a loop changes with time Change∈ flux o Change∈time ) emf =−N ¿ Lenz’s law: an induced current always flows in the direction that opposes the change that caused it. Electric field caused by the motion of a rod: o E=Bv When a switch is added to a circuit and when the switch is closed, the current starts to increase immediately. As time goes on, the current increases more slowly and the potential difference across the inductor decrea
