A square coil of wire has 10 turns and an area of 20 cm^2. The square coil is located in a variable magnetic field whose behavior is shown on the graph. The magnetic field is directed at an angle of 45° relative to the normal to the plane of the square coil. a. What is the average emf induced in the coil in the time interval from t=7.50 s to 10.0 s? b. If the wire has a resistance of 0.75 Ω determine the induced current for the interval from part (a)?

A 1000 turn coil is moved from a location where there the magnetic field is 25.00 T to a location wherethere is no magnetic field. It takes 0.5 s to move the coil and the induced voltage. The induced voltage is 50.00volts. What is the cross-sectional area of the coil in ?2? What is the diameter of the coil in units of cm?

A square loop made of a metal wire is placed on the page. The length of both sides of the square decreases uniformly from 4.0 cm to 3.0 cm in 25 seconds. The loop is in a constant, uniform magnetic field directed out of the page and with a magnitude of 6.0 T. 1 cm = 0.01 m. 1. What is the average magnitude of the induced EMF produced in the loop during that time? 2. What is the direction of the induced electric current in the loop (explain in terms of B lines)?

Consider the wires that carry electric current and are arranged as shown below. In this case the length of segment a = 12 cm, b 16 cm. Where the current flowing along the wire i = 4.5t² - 10 t = – (where i is in amperes, t is in seconds).

003 A circular coil of wire 7.8 cm in diameter has a resistance of 1.61 2. It is located in a magnetic field of 0.304 T directed at right angles to the plane of the coil. The coil is removed from the field in 0.169 s. What is the induced emf in the coil? As- sume the magnetic flux is reduced linearly. Answer in units of V. How much electric energy is lost in the process? Answer in units of J.

The generator at a large power plant has an output of 1,800,000 kw at 30,000 v.  a. If it were a DC generator, what would be the current in it? b. What is it’s energy output each day in kilowatt hours?

A circular loop with a radius of 2.5 m rests horizontally inside a uniform magnetic field of 0.9 T in a down direction. What is the induced emf when the magnetic field drops to zero in 0.75 s? O a. 9.40 V O b. 23.6 V O c. 34.2 V O d. 17.5 V

A 65 turn, 10.0 cm diameter coil rotates at an angular velocity of 8.00 rad/s in a 1.30 T field, starting with the normal of the plane of the coil perpendicular to the field. Assume that the positive max emf is reached first. a. What (in V) is the peak emf? b. At what time (in s) is the peak emf first reached? c. At what time (in s) is the emf first at its most negative? d. What is the period (in s) of the AC voltage output?

A solenoid has n= 120 turns per meter, and it is filled with a ferromagnetic material (km = 65). When the current through the solenoid is increasing at the rate of 2.0 A/s, the voltage induce in the solenoid is 25 V. a. Determine the inductance of the solenoid. b. What is the magnitude of the induced electric field inside of the solenoid at the radial distance r= 0.020 m from the axis of the solenoid?

b. Derive an expression for the magnitude of the induced emf in the loop as a function of time for the interval t = 0 s to t = 6 s. c. Calculate the magnitude of the induced current at time t = 3 s. d. Sketch a graph of the induced current in the loop as a function of time from t = 0 s to t = 18 s. Show the direction of the induced current on the loop depicted in the Figure above. e. Calculate the total energy dissipated in the loop during the first 6 seconds.