A metal wheel with 8 metallic spokes, each 60 cm long is rotated at a speed of 100 rev./min in a plane perpendicular to earth magnetic field of 0.3 ×10T. Find the magnitude of the induced emf between the axle and the rim of the wheel.
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- As shown in the figure, a metal bar of length l= 0.25 m is free to slide on frictionless rails. A uniform magnetic field B= 2.8 T, perpendicular to the plane of the rails and pointing outward from the page, is present. The bar is in a downward motion with a velocity of magnitude v=2 m/s. What is the magnitude and direction of the induced current through the resistor R=4 ohms O BO RIn the figure below, an iron bar sitting on two parallel copper rails, connected to each other by a resistor, is pulled to the right at a constant speed. The resistance R = 6.00 02, the distance between the rails is l = 1.20 m, and a uniform 2.10 T magnetic field is directed into the page. At what speed (in m/s) should the bar be moved to produce a current of 0.500 A in the resistor? {R m/s Fapp ℗The component of the external magnetic field along the central axis of a 50 turn coil of radius 40.0 cm decreases from 2.90 T to 0.550 T in 3.00 s. The resistance of the coil is 4.50 Ohms. What is the magnitude of the current induced in the coil?
- A 2.00-m length of wire is held in an east−west direction and moves horizontally to the north with a speed of 15.0 m/s. The vertical component of Earth’s magnetic field in this region is 40.0 μT directed downward. Calculate the induced emf between the ends of the wire and determine which end is positive.In the figure below, a metal bar sitting on 2 parallel conducting rails connected to each other by a resistor is pulled to the right at a constant speed. The resistance R=9 ohms, the distance between the rails is l=1.2m and a uniform 2.10T magnetic field is directed into the page. At what speed (m/s) should the bar be moved to produce a current of .500 A in the resistor?Consider A rod of length 40 cm moving with a velocity of 30 m/s to the left in a magnetic field of 0.2 T into the page. The loop has a small resistance of 2 ohms. Find a) the emf in the loop b) the magnitude and direction of induced current c) the magnetic force acting on the rod and its direction