emfhalo. A single hoop of metal wire is placed near a localized region of uniform magnetic field that is directed into the page. Which of the following processes will lead to an induced emf and induced current on the hoop? I. II. X X K xxx XXX x² xxxx x xx Hoop rotating clockwise (Axis is perpendicular to the page) x X xxx xxx xxx X x 14 Decreasing magnetic field magnitude III. C xx xx xx A xx Х Х Х Х Х Х Х Х Х Х Hoop moving downward xxx X xxx xxxx X X Hoop rotating about the horizontal axis X XX OA. I and IV only OB. I, III, and IV only O C. I, II, III, and IV OD. I, II, and III only IV.

R OF е Fapp Figure P20.18 2003 Thomson Brooks Cole (c20p18) Consider the arrangement shown in Figure P20.18. Assume that R = 7.00 £2 and I = 1.00 m, and that a uniform 1.60-T magnetic field is directed into the page. At what speed should the bar be moved to produce a current of 0.400-A in the resistor?

1 Problem 4: UP 12.55 A solenoid with 25 turns per centimeter carries a current I. Inside the solenoid, an electron moves uniformly in a circle with radius 2.0 cm, with the circle perpendicular to the axis of the solenoid. If the speed of the electron is 2.0 x 105 m/s, what is the current I in the solenoid?

A 1 kg horizontal aluminum bar, 0.1 m long, is pushed by a force F between two vertical metal rods that are 0.1 m apart. A 0.1T magnetic field is directed perpendicular to the plane of the rods as indicated. A 5 Q resistor is connected across the two rods at the bottom. What is the direction of the current through the aluminum bar? Aluminum bar

A uniform magnetic field is applied paralle to the axis of a 60-turn circular coil with a radius of 6.0 cm and a resistance of 0.90 ̛. If the magnetic field increases uniformly from 0.20 T to 1.8 T in 0.20 s, what is the magnitude of the emf induced in the coil? A) 16 V B) 12 V C) 9.2 V D) 7.2 V E) 5.4 V

A conducting ring is moving from left to right through a region that contains a constant magnetic field as shown in the diagram. In which regions is there an induced current in the ring?

QUESTION 1 A coil of ten turns of area 0.01 m2 and resistance 5 Q is placed perpendicularly inside a magnetic field whose intensity and direction changes as given in the figure. What is the magnitude of the flux of magnetic field crossing the area of the coil at time = 6 sec? B(T) 0.1 0.3 0.5 0.8 0.9 t(s) -1 -2 O 2 Wb O 0.2 Wb O 20 Wb O 0.02 Wb O none of these

The component of the external magnetic field along the central axis of a 33 turn circular coil of radius 27.0 cm decreases from 1.90 T to 0.400 T in 2.90 s. If the resistance of the coil is R = 6.00 52, what is the magnitude of the induced current in the coil? magnitude: What is the direction of the current if the axial component of the field points away from the viewer? counter-clockwise O clockwise

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

A helicopter (see figure below) has blades of length 2.80 m; extending out from a central hub and rotating at 3.40 rev/s. If the vertical component of the Earth's magnetic field is 50.0 μT, what is the magnitude of emf induced between the blade tip and the center hub? mV Sascha Hahn/Shutterstock.com