Guided course 06:57Introduction to Electromagnetic (EM) Waves - Speed of LightPatrick Ford1129views16rank
09:25Astronomy - Ch. 5: Light & E&M Radiation (5 of 30) How Are E&M Waves Produced?Michel van Biezen325views
Multiple ChoiceWhat is the magnetic field amplitude of an electromagnetic wave that has electric field amplitude 1500 V/m ?278views
Multiple ChoiceA 50W lightbulb emits light uniformly in all directions. What is the electric field amplitude 10cm away from the lightbulb?194views
Multiple ChoiceAlice observes an electric field, E⇀=(30Vm)k^, and a magnetic field B⇀=(0.10T)i^. Bob is cruising by, with velocity v⇀=(100ms)j^, in Alice's reference frame. What electric field does Bob observe?257views
Multiple ChoiceYou measure the electric field of an electromagnetic wave at a particular moment and find it points in the +z direction. The magnetic field points in the +y direction. In which direction is this wave traveling?181views1comments
Multiple ChoiceYou measure the magnetic field strength of a traveling electromagnetic wave to be 8.0×10−7T8.0\times10^{-7}T8.0×10−7T , oriented along the +x direction. If this EM wave moves in the +y direction, what is the magnitude and direction of the wave's electric field at that same exact spot?188views6rank
Textbook QuestionThe magnetic field B at all points within the colored circle shown in Fig. E29.15 has an initial magnitude of 0.750 T. (The circle could represent approximately the space inside a long, thin solenoid.) The magnetic field is directed into the plane of the diagram and is decreasing at the rate of -0.0350 T/s. (c) What is the current in the ring if its resistance is 4.00 Ω?217views
Textbook QuestionThe magnetic field within a long, straight solenoid with a circular cross section and radius R is increasing at a rate of dB/dt. (a) What is the rate of change of flux through a circle with radius r_1 inside the solenoid, normal to the axis of the solenoid, and with center on the solenoid axis? (b) Find the magnitude of the induced electric field inside the solenoid, at a distance r_1 from its axis. Show the direction of this field in a diagram. (c) What is the magnitude of the induced electric field outside the solenoid, at a distance r_2 from the axis?318views