R A 50 cm long metal rod moves along the two rails in a plane of the circuit shown and is placed perpendicular to the magnetic field ( indicated by x) B = 0.15 T. If R = 3.0 ohm and the uniform speed v = 2.0 m/s, what rate is the energy dissipated in the resistor? O 1.25 W O 7.5 mW 4.9 mW 2.26 mW

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?

Q4: Show detailed work and pay attention to the units. There are two different ways to calculate the potential difference across the bar, using the motional EMF expression or Faraday's Law. Show that both methods give the same answer. Use the right hand rule to figure out which end of the bar (A or B) will be at a higher potential due to the motion of the conductor in the field.

Can you please answer the question!! THE ANSWERS ARE NOT 18.4 W OR 39.1 W!!!!

A single ring is moving through a magnetic field that varies in strength. The ring has a radius of 9.5 cm and it is moving at a velocity of 30 S The ring is oriented so that the magnetic field passes directly through the ring. It moves such that the magnitude of the magnetic field through the ring changes from 0.84 T to 2.25 T in 0.21 s. What is the magnitude of the induced emf in the ring? emf = V You measure the induced current in the ring as 1.54 A. What is the resistance of the ring? R = Ω What changes could you make in the system to increase the induced emf in the ring? Increase the number of loops in the ring Increase the velocity of the ring through the magnetic field Decrease the velocity of the ring through the magnetic field Decrease the area of the ring Increase the area of the ring Decrease the number of loops in the ring O O O O O

A long solenoid (radius = 3.0 cm, 2500 turns per meter) carries a current given by I = 0.30 sin(200 t) A, where t is measured in s. When t = 2.5 ms, what is the magnitude of the induced electric field at a point which is 4.0 cm from the axis of the solenoid? O 9.3 x 10-3 V/m O 1.9 x 10-3 V/m O 8.0 x 10-3 V/m O 6.7 x 10-3 V/m O 5.3 10-3 V/m

A coil of wire with 50 turns lies in the plane of the page and has an initial area of 0.310 m2. The coil is now stretched to have no area in 0.100 s. What is the magnitude and direction of the average value of the induced emf if the uniform magnetic field points into the page and has a strength of 1.25 T? Magnitude? ___ V Direction?

A generator has a coil with 1260 turns that are each 0.020 m in diameter. The coil rotates at 3600 rpm in a 0.670 T magnetic field. If a 20.0 Ω resistive load is connected in parallel with the generator, what is the average power used by the load?   ____ W

A 2.00×10-2 Ω square wire loop 40.0 cm on a side has its plane normal to a uniform magnetic field of magnitude B = 3.0 T. If you pull two opposite sides of the loop away from each other, the other two sides automatically draw toward each other, reducing the area enclosed by the loop.If the area is reduced to zero in a time of 0.30 s what is the average emf during this time interval?  What is the average current during this time interval?

Currents in dc transmission lines can be 100 A or higher. Some people are concerned that the electromagnetic fields from such lines near their homes could pose health dangers. For a line that has current 130 A and a height of 8.0 m above the ground, what magnetic field does the line produce at ground level? Express your answer in tes Express your answer in teslas. B = Submit Part B B BE = Submit What magnetic field does the line produce at ground level as a percent of the earth's magnetic field, which is 0.50 G. Express your answer as a percentage. ΓΕΙΑΣΦ Part C OO ΑΣΦ I Request Answer Request Answer Is this value of magnetic field cause for worry? ? T ? % No. Since this field does not differ a lot from the earth's magnetic field, it would be expected to have almost the same effect as the earth's field. Yes. Since this field does not differ a lot from the earth's magnetic field, it would be expected to have almost the same effect as the earth's field. No. Since this field is much…