A 0.250-m-long bar moves on parallel rails that are connected through a 6.00@ resistor, as shown in Fig. E29.33, so the apparatus makes a complete circuit. You can ignore the resistance of the bar and rails. The circuit is in a uniform magnetic field B = 1.20 T that is directed into the plane of the figure. At an instant when the induced current in the circuit is counterclockwise and equal to 1.75 A, what is the velocity of the bar (magnitude and direction)?
Chapter 5 Notes The bigger the amplitude of pressure variations is, the bigger the energy that is being carried by the waves Energy carried by the wave is proportional to a square of amplitude- E- A^2 Power is the energy point per unit time P= E/T The unit of Power is the Watt (W) Power as a result, characterizes the ability of our source to emit waves but says little about how much energy is caught by a particular receiver Intensity is the power delivered to a particular point or l= P/s The intensity does not have special units and is measured just in units of power divided by units of area W/m^2 Intensity at any given point depends on the amplitude of a wave: proportional to the square of amplitude Increasing a distance from a source obviously decreases the loudness of the s