The axle of a railway engine is of length 1.5 m. Calculate the e.m.f. that will exist between the ends of the axles if the engine moves with a speed 60 km/hr. The angle of dip 46° and the horizontal component of earth's magnetic induction is 3.6 x 105Wb/m². $ =
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- An electron moves in a circular path with a speed of 1.22 x 10' m/s in the presence of a uniform magnetic field with a magnitude of 2.12 mT. The electron's path is perpendicular to the field. (a) What is the radius (in cm) of the circular path? cm (b) How long (in s) does it take the electron to complete one revolution? SIn the figure, a conducting rod of length L= 25.0 cm moves in a magnetic field B → of magnitude 0.490 T directed into the plane of the figure. The rod moves with speed v = 4.00 m/s in the direction shown. When the charges in the rod are in equilibrium, what is the magnitude E of the electric field within the rod? What is the magnitude Vba of the potential difference between the ends of the rod? What is the magnitude E of the motional emf induced in the rod?A circular coil of wire of 200 turns and diameter 5 cm carries a current of 4 A. It is placed in a magnetic field of 0.70 T with the plane of the coil making an angle of 30° with the magnetic field. What is the torque on the coil? 2.5 N·m 1.8 N.m 0.48 N.m 0.95 N·m
- The magnetic field inside an instrument is(B→=( 2.3 i^i^ - 1.4 j^)Tj^)T where B→ represents the magnetic field vector and TT stands for tesla, the unit of the magnetic field. a) What is the magnitude of the magnetic field? b) What is the direction of the magnetic field?An electron moves in a circular path with a speed of 1.49 x 10' m/s in the presence of a uniform magnetic field with a magnitude of 1.88 mT. The electron's path is perpendicular to the field. (a) What is the radius (in cm) of the circular path? cm (b) How long (in s) does it take the electron to complete one revolution? SA proton travelling at a high velocity enters a 0.45 T magnetic field and travels in a circular path of radius 0.28 m as shown. A B=0.45 T X X X X X X X X X X X B What is the kinetic energy of the proton? And which path will the proton follow? A or B? x X X X X
- A 13-cm length of wire is held along an east-west direction and moved horizontally to the north with a speed of 2.2 m/s in a region where the magnetic field of the earth is 55 micro-T directed 28° below the horizontal. What is the magnitude of the potential difference between the ends of the wire? Write your answer in micro-volts.= The figure shows a solid metal object moving through a uniform magnetic field given by B (7.00 x 10-2T) k. The motion creates a potential difference of 1.30 x 103 V across the object, with the (unseen) bottom face negatively charged. What is the speed (m/s) of the object? d₁=5.00 x 102 m, d2= 3.00 x 102 m, d3 = 2.00 × 10² m. A do ds