A metal ring 4.80 cm in diameter is placed between the north and south poles of large magnets with the plane of its area perpendicular to the magnetic field. These magnets produce an initial uniform field of 1.12 T between them but are gradually pulled apart, causing this field to remain uniform but decrease steadily at 0.220 T/s. Part A What is the magnitude of the electric field induced in the ring? [ΨΕΙ ΑΣΦ ? V/m Request Answer Part B In which direction (clockwise or counterclockwise) does the current flow as viewed by someone on the south pole O Counterclockwise O Clockwise E= Submit the magnet?

A small circular coil of 20 loops of wire having a radius of 1 cm is at rest in the X-y plane (so the normal to the loop points in the +z-direction). A uniform magnetic field of 0.5 T is turned on in the +x-direction. What is the magnetic flux through the loop? a. 7.85 x 10 Tm² b. 1.57 x 10 4 T m² O c. 3.14 x 10 3 T m2 O d. 0 T m2

The magnetic field B at all points within the colored circle of the figure (Figure 1)has an initial magnitude of 0.700 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 0.0300 T/s. Figure X X X X X B X /b X 1 of 1 10.0 cm Part C What is the current in the ring if its resistance is 4.00 $? ΑΣΦ I = Submit Part D X Incorrect; Try Again; 5 attempts remaining What is the emf between points a and b on the ring? ε = Previous Answers Request Answer Submit Part E ΠΙΑΣΦ Request Answer ? IVE ΑΣΦ ? A If the ring is cut at some point and the ends are separated slightly, what will be the emf between the ends? ? V

A coil has 200 turns enclosing an area of 10.8 cm² . In a physics laboratory experiment, the coil is rotated during the time interval 0.036 s from a position in which the plane of each turn is perpendicular to Earth's magnetic field to one in which the plane of each turn is parallel to the field. The magnitude of Earth's magnetic field at the lab location is 6.00×10-5 T. Part A What is the magnitude of the magnetic flux through one turn of the coil before it is rotated? Express your answer in webers. ► View Available Hint(s) | Þinitial Submit —| ΑΣΦ Part B xa Xb 7 √x V x 2.0.10 5 Previous Answers X <४ |X| ? X.10n X www Wb X Incorrect; Try Again; 2 attempts remaining The angle between the magnetic field and the area vector of the coil is either 0 or 180 degrees. Note that you can choose to view the coil from either side, as long as you stick to using the same side for the entire calculation/experiment. This gives a factor of ±1 in the formula for flux. What is the magnitude of the…

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A parallel-plate air-filled capacitor is being charged as in the figure (Figure 1). The circular plates have radius 3.90 cm, and at a particular instant, the conduction current in the wires is 0.273 A. Figure 1 of 1 9 b E B -9 Part A What is the displacement current density jp in the air space between the plates? IVE| ΑΣΦ ]]? JD = A/m² Submit Request Answer ▾ Part B What is the rate at which the electric field between the plates is changing? VG| ΑΣΦ ]] ? dE dt V/m.s Submit Request Answer

Part A You've recently read about a chemical laser that generates a 20.0-cm-diameter, 24.0 MW laser beam. One day, after physics class, you start to wonder if you could use the radiation pressure from this laser beam to launch small payloads into orbit. To see if this might be feasible, you do a quick calculation of the acceleration of a 20.0-cm- What speed would such a block have if pushed horizontally 95.0 m along a frictionless track by such a laser? Express your answer with the appropriate units. diameter, 98.0 kg, perfectly absorbing block. HA ? Value Units

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j ust A please!