05:45Lenz's Law | Magnetic forces, magnetic fields, and Faraday's law | Physics | Khan AcademyKhan Academy365views
Multiple ChoiceAn outer ring is connected to a variable voltage source. If the battery's voltage is continuously INCREASING, what is the direction of the induced current in the inner ring, centered inside of the outer ring?599views10rank3comments
Multiple ChoiceWhat emf is created in a 1.3m long conductor moving at 45 m/s in a 3.0 mT magnetic field? Assume the conductor's velocity is perpendicular to the field.371views1rank
Multiple Choice If the metal triangle shown in the figure is pushed to the left, farther into the magnetic field, what is the direction of the induced current in the triangle?292views1rank
Multiple ChoiceIn a region of space, a magnetic field is increasing at 3T/s. A square loop of wire with a side of 12cm is oriented perpendicular to the field. The loop has a total resistance of 0.02Ω. What current is induced in the loop?221views
Textbook QuestionA circular loop of wire with radius r = 0.0480 m and resistance R = 0.160 Ω is in a region of spatially uniform magnetic field, as shown in Fig. E29.22. The magnetic field is directed out of the plane of the figure. The magnetic field has an initial value of 8.00 T and is decreasing at a rate of dB/dt = -0.680 T/s. (a) Is the induced current in the loop clockwise or counterclockwise?441views
Textbook QuestionThe current in Fig. E29.18 obeys the equation I(t) = I_0e^(-bt), where b > 0. Find the direction (clockwise or counterclockwise) of the current induced in the round coil for t > 0.275views1rank
Textbook QuestionA circular loop of wire is in a region of spatially uniform mag-netic field, as shown in Fig. E29.15. The magnetic field is directed into the plane of the figure. Determine the direction (clockwise or counterclock-wise) of the induced current in the loop when (a) B is increasing; (b) B is decreasing; (c) B is constant with value B_0. Explain your reasoning.985views
Textbook QuestionShrinking Loop. A circular loop of flexible iron wire has an initial circumference of 165.0 cm, but its circumference is decreasing at a constant rate of 12.0 cm/s due to a tangential pull on the wire. The loop is in a constant, uniform magnetic field oriented perpendicular to the plane of the loop and with magnitude 0.500 T. (b) Find the direction of the induced current in the loop as viewed looking along the direction of the magnetic field.623views
Textbook QuestionA single loop of wire with an area of 0.0900 m^2 is in a uniform magnetic field that has an initial value of 3.80 T, is perpendicular to the plane of the loop, and is decreasing at a constant rate of 0.190 T/s. (b) If the loop has a resistance of 0.600 Ω, find the current induced in the loop.553views