Question

An electron (m_p = 9.1 times 10^-31 kg, q_p = -1.6 times 10^-19 C) travels at 4 times 10^5 m/s in a direction perpendicular to a uniform 3.0 mT magnetic field. What is the diameter of its path? Two long straight wires each carrying a current of 200 A in the same directions are separated by a distance of 40 cm. Calculate the force on a 2m long section of wire. Is the force attractive or repulsive? An electron is traveling North at v = 3 times 10^4 m/s. There is a uniform magnetic field of 50 mT pointing East. A uniform electric field is applied so that the electron travels in a straight line. What is the magnitude and direction (N, S, E, W, Up, or Down) of the electric field? In the drawing shown at the right, the wire at C carries 5A and the wire at D carries 3A. Calculate the magnitude and direction of the magnetic field at F. The electric field in an electromagnetic wave has a maximum field strength of 15 kV/m. Calculate the maximum magnetic field strength. A motor draws a current of 30A at startup when connected to a 120V power supply. It draws only 5 A at its operating speed. What are its internal resistance and its back EMF? The bottom end of the FM band is 88.1 MHz. What is the wavelength of this signal? A transformer has 100 turns on the primary side and 5 turns on the secondary side. The primary side is plugged into the wall supplying 120V AC. What is output voltage of the transformer? In an RL series circuit with a 10 Ohm resistor and a 40 mH inductor connected to a 5V battery, a switch is closed at time t=0. At what time is there a voltage of 4V across the resistor? What Hall voltage is produced by a 300 mT field applied across a 2.5 cm diameter pipe carrying a fluid moving at 50.0 cm/s?

Answer 1

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