Hence, we can draw vector diagrams for force. Other examples: lifting, pressing, twisting, stretching…etc Force is a vector, it has magnitude and direction. Forces – Agent & Object A force is a push or a pull. Described by a magnitude and a direction All vector rules apply. Force is not a thing on its own, its arises from interactions between objects. PHYS 2010- Chapter 4 Notes What Is Force Definition: A force is something that is changes or tends to the state of rest or motion of an object. What is the polarity of the emf? (e) Determine the time at which the current through R reverses its direction. (d) Determine the emf in the ring at a time t = 1.21 * 10-2 s. Determine the internal resistance of the ring. What is the polarity of the emf? (c) Because of the internal resistance of the ring, the current through R at the time given in part (b) is onl圓.00 mA. (b) Determine the emf induced in the ring at time t = 5.00 * 10-3 s. (a) Derive an expression, as a function of time, for the total magnetic flux B through the ring. There is no magnetic field at the location of the external circuit. P29.58) there is a small gap in the ring with wires leading to an external circuit of resistance R = 12.0. In this expression, t0 = 0.0100 s and is constant, t is time, k n is the unit vector in the +z-direction, and B0 = 0.0800 T and is constant. A circular conducting ring with radius r0 = 0.0420 m lies in the xy-plane in a region of uniform magnetic field B S = B0 31 - 31t>t022 + 21t>t023 4k n.
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